This is one of the best 75Ohm cables ever made! Nordost 75 Ohm Silver HD SPDIF cable - rare RCA to BNC ideal for CHORD, NAIM LINN DACs etc. from CD transports/players or Streamers. This is a coaxial DUAL micro monofilament silver-plated 99.9999% OFC - 75 Ohm cable from one of the top brands in audio cables. (YES! THAT IS SILVER PLATED 6 NINES OXYGEN FREE COPPER) The dual micro-monofilaments are the two plastic filler wires that space the silver-plated conductor from the middle of the teflon tube, thus providing a mostly air dielectric - improving performance by reducing the dielectric effect which causes phase shift and jitter. Brand new connectors - Hicon (by Sommer of Germany) gold plated BNC and RCA Phono plug (This is the brand that supply Nordost with their connectors). The cable is cut from a long length of used cable - but as you can see the distinctive two-colour shield is shiny as is the centre conductor silver plated copper I have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, labelled orange for SPDIF, fully tested and burned in the cable. n.b. The Chord Qutest is NOT included in the sale obviously! Burn In 48 Hours burn in using the Tara Labs Cascade Burn in file – from their website…“The new CASCADE noise burn-in disc is a proprietary combination of white noise with frequency tone bursts and pink noise mixed at different levels. However, what makes it really effective is a series of descending and ascending (cascading) multi-octave square sweeps for better and more complete results than any other “burn-in” discs that have been made to date. The CASCADE noise burn-in disc may be used with audio electronic component and with audio cable including cables with attachments such as batteries or filter networks. Before and after results will be obvious with any of these cables.”

Nordost 75 Ohm Silver plated SPDIF cable - rare RCA - BNC ideal for CHORD, NAIM LINN DACs etc. as you can connect without using adaptors which compromise performance. This is a coaxial micro monofilament silver-plated 99.9999% OFC - 75 Ohm cable from one of the top brands in audio cables. (YES THAT IS SILVER PLATED 6 NINES OXYGEN FREE COPPER) The micro-monofilament is a plastic filler wires that spaces the silver plated conductor from the middle of the teflon tube, thus providing a mostly air dielectric - improving performance. ***Please see the feedback for these Nordost cables I have assembled, one customer bought one and then ordered two more he was so delighted with the performance with his NAIM equipment *** Brand new RCA connector - Nordost Wyrewizard gold plated and The BNC is the original from the Nordost cable. The cable is cut from a long length of used cable - but as you can see the distinctive two colour shield is shiny as is the centre conductor silver plated copper I have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, labelled orange for SPDIF, fully tested and burned in the cable.These cables were originally sold as 75 Ohm cables in a bundle of three for component video - manufacturers just sold a single version of the same cable for digital SPDIF. (The 75Ohm characteristic impedance specification for SPDIF and Component Video is identical) They are exactly the same cables just with different labels. This means you get a fabulous quality Nordost cable at a bargain price.n.b. The Chord Qutest is NOT included in the sale obviously!

Nordost 75 Ohm Silver plated SPDIF cable - rare RCA - BNC ideal for CHORD, NAIM LINN DACs etc. as you can connect without using adaptors which compromise performance. This is a coaxial micro monofilament silver-plated 99.9999% OFC - 75 Ohm cable from one of the top brands in audio cables. (YES THAT IS SILVER PLATED 6 NINES OXYGEN FREE COPPER) The micro-monofilament is a plastic filler wires that spaces the silver plated conductor from the middle of the teflon tube, thus providing a mostly air dielectric - improving performance. ***Please see the feedback for these Nordost cables I have assembled, one customer bought one and then ordered two more he was so delighted with the performance with his NAIM equipment *** Brand new RCA connector - Nordost Wyrewizard gold plated and The BNC is the original from the Nordost cable. The cable is cut from a long length of used cable - but as you can see the distinctive two colour shield is shiny as is the centre conductor silver plated copper I have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, labelled orange for SPDIF, fully tested and burned in the cable.These cables were originally sold as 75 Ohm cables in a bundle of three for component video - manufacturers just sold a single version of the same cable for digital SPDIF. (The 75Ohm characteristic impedance specification for SPDIF and Component Video is identical) They are exactly the same cables just with different labels. This means you get a fabulous quality Nordost cable at a bargain price.n.b. The Chord Qutest is NOT included in the sale obviously!

Nordost 75 Ohm Silver HD SPDIF cable - rare RCA to BNC ideal for CHORD, NAIM LINN DACs etc.  We also added a screen and two Wurth High-Frequency Ferrite beads to reduce noise. This is a unique construction to us. We are continually innovating to improve sound quality. It preserves the characteristic fast Nordost sound but eliminates effects of ground plane noise, RFI, etc., on the sound. Tested with the Chord DAVE and Qutest. This is a coaxial DUAL micro monofilament silver-plated 99.9999% OFC - 75 Ohm cable from one of the top brands in audio cables.  (YES, THAT IS SILVER-PLATED 6 NINES OXYGEN FREE COPPER)   The dual micro-monofilaments are the two plastic filler wires that space the silver-plated conductor from the middle of the FEP tube, thus providing a mostly air dielectric - improving performance.   Brand new BNC connectors - Yarbo Audiophile BNC - gold plated copper.  Original Nordost 75Ohm RCA. We have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, thoroughly tested, and burned in the cable. These cables were originally sold as 75 Ohm cables in a bundle of three for component video - manufacturers just sold a single version of the same cable for digital SPDIF. (The specification for SPDIF and Component Video is identical) They are precisely the same, just with different labels. This means you get a fabulous quality Nordost cable at a bargain price. n.b. The Chord Qutest is NOT included in the sale, obviously! 1.5m is the minimum length that an SPDIF cable should be – see explanation below.   From Nordost This new design introduces more air space between the conductor and the FEP insulation reducing dielectric contact by more than 85%. The result is a cable with much lower capacitance and resistance, resulting in higher signal speed and resolution.  Why SPDIF cables should be 1.5m long. ·       When the SPDIF signal is launched into the cable from the Transport, it is essentially a voltage square wave consisting of rising edges and falling edges. These edges are no more than voltage transitions from about –250mV to +250mV, the rising edge transitioning from minus voltage to plus voltage, and the falling edge transitioning from plus voltage to minus voltage. When an edge transitions, it can be described as having a rise-time or fall time. This is the time for the signal to transition from 10% to 90% of the entire voltage swing. (note that this DOES Not happen instantaneously)  ·       The rise time is important because this causes reflections on the transmission-line. If the rise time were very slow, say 50 nanoseconds, then there would be no reflections on the transmission-line unless it was extremely long.  ·       Alternately, if the rise-time were less than 1 nanosecond, reflections would occur at every boundary, such as the connection from the circuit board to the wires that go to the connector. ·       Typical stock Transports have around 25 nanosecond rise times. The primary concern for the manufacturer is to pass FCC regulations for emissions and electromagnetic interference and make the interface reliable. When the regulatory testing is done, they attach very inexpensive, inferior cables and measure the emissions. To insure that the manufacturer passes these tests, they take several precautions. One is designing in the slower than necessary 25 nanosecond rise-time. Another is inserting various filters in the Transport to eliminate high frequencies from the signal. As a result of these choices, there is a hazard created by using too short a digital cable. It is a result of the slow rise time.  ·       When a transition is launched into the cable, it takes a period of time to propagate or transmit to the other end. This propagation time is somewhat slower than the speed of light, usually around 2 nanoseconds per foot, but can be longer depending on the dielectrics used in the digital cable. When the transition reaches the end of the transmission line (in the DAC), a reflection can occur that propagates back to the driver in the Transport. Small reflections can occur in even well matched systems. When the reflection reaches the driver, it can again be reflected back toward the DAC. This ping-pong effect can sustain itself for several bounces depending on the losses in the cable. It is not unusual to see 3-5 of these reflections before they finally decay away, particularly when using the best digital cables, which are usually low-loss. ·       So, how does this affect the jitter? When the first reflection returns to the DAC, if the transition already in process at the receiver has not been completed, the reflection voltage will superimpose itself on the transition voltage, causing the transition to shift in time. The DAC will sample the transition in this time-shifted state, and there you have jitter.  ·       Let’s look at a numerical example: ·       If the rise time is 25 nanoseconds and the cable length is 3 feet, then the propagation time is about 6 nanoseconds. Once the transition has arrived at the receiver, the reflection propagates back to the driver (6 nanoseconds), and then the driver reflects this back to the receiver (6 nanoseconds) = 12 nanoseconds. So, as seen at the receiver, 12 nanoseconds after the 25 nanosecond transition started, we have a reflection superimposing on the transition. This is right about the time that the receiver will try to sample the transition, right around 0 volts DC. Not good. Now if the cable had been 1.5 meters, the reflection would have arrived 18 nanoseconds after the 25 nanosecond transition started at the receiver. This is much better because the receiver has likely already sampled the transition by this time.     Burn In   48 Hours burn in using the Tara Labs Cascade Burn in file – from their website…“The new CASCADE noise burn-in disc is a proprietary combination of white noise with frequency tone bursts and pink noise mixed at different levels. However, what makes it effective is a series of descending and ascending (cascading) multi-octave square sweeps for better and more complete results than any other “burn-in” discs that have been made to date. The CASCADE noise burn-in disc may be used with an audio electronic component and with an audio cable, including cables with attachments such as batteries or filter networks. Before and after results will be obvious with any of these cables.”          

Nordost 75 Ohm Silver plated SPDIF cable - rare RCA - BNC ideal for CHORD, NAIM LINN DACs etc. as you can connect without using adaptors which compromise performance. This is a coaxial micro monofilament silver-plated 99.9999% OFC - 75 Ohm cable from one of the top brands in audio cables. (YES THAT IS SILVER PLATED 6 NINES OXYGEN FREE COPPER) The micro-monofilament is a plastic filler wires that spaces the silver plated conductor from the middle of the teflon tube, thus providing a mostly air dielectric - improving performance. ***Please see the feedback for these Nordost cables I have assembled, one customer bought one and then ordered two more he was so delighted with the performance with his NAIM equipment *** Brand new BNC connectors - Hicon (by Sommer of Germany) gold plated BNC and The RCA is the original also made by Hicon and labelled Nordost and is an unusual 75Ohm design. The cable is cut from a long length of used cable - but as you can see the distinctive two colour shield is shiny as is the centre conductor silver plated copper I have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, labelled orange for SPDIF, fully tested and burned in the cable.These cables were originally sold as 75 Ohm cables in a bundle of three for component video - manufacturers just sold a single version of the same cable for digital SPDIF. (The 75Ohm characteristic impedance specification for SPDIF and Component Video is identical) They are exactly the same cables just with different labels. This means you get a fabulous quality Nordost cable at a bargain price.n.b. The Chord Qutest is NOT included in the sale obviously! Length of cable – why 1.5m? Summary There are only two occasions in audio where a longer cable – or an optimum length cable is better than a short one. With Digital cables there is an optimum length of 1.5m or more. (The other occasion is for MM phono cartridges, which need a specific capacitance). The reason for this requires an explanation. Please refer to diagram in the photos. The signal travelling down a SPDIF (so called digital cable) is actually a square wave ANALOGUE voltage signal, however in reality this square does not have instantaneous changes - the squares are sloped and somewhat rounded off too as it takes some time to change state from 0 to 1 or 1 to 0. The accuracy of the pulses at the end of the cable determine how accurately the source can interpret the signal in value 1 or 0 and also timing which not so easy. The signal reflects back off the ends of the cable, the plugs and connected equipment (echoing back and forth) and produces ghost images of itself, which can fool the receiver into thinking that the “ghost” signals are the original signals. With short cables, under 1m, the ghost signals arrive close to the originals within the time frame of transition from 0 to 1 or 1 to 0, before the transition occurs. A 1m cable means the reflection arrives at about the same time as the transition is to be recorded. With longer cables the reflection arrives too late to influence the receiver (The transition has already been recorded). Longer cables also mean lower amplitude or signal reflection thus receiver can more easily determine between the correct signal and the spurious reflections. The bottom line as that a longer cable eliminates the false readings from the ghost images, and thus reduces timing errors, called jitter and thus sounds better. The optimum size has been determined by measurements and experimentation to be 1.5m or more. Detailed Technical Explanation for those with an enquiring mind. Why SPDIF cables should be 1.5m long. When the SPDIF signal is launched into the cable from the Transport, it is essentially a voltage square-wave, consisting of rising edges and falling edges. These edges are no more than transitions of voltage from about –250mV to +250mV, the rising edge transitioning from minus voltage to plus voltage and the falling edge transitioning from plus voltage to minus voltage. When an edge transitions, it can be described as having a rise-time or fall-time. This is the time it takes for the signal to transition from 10% to 90% of the entire voltage swing. (note that this DOES Not happen instantaneously) The rise-time is important because this is what causes reflections on the transmission-line. If the rise-time were very, very slow, say 50 nanoseconds, then there would be no reflections on the transmission-line unless it was extremely long. Alternately, if the rise-time were less than 1 nanosecond, reflections would occur at every boundary, such as the connection from the circuit board to the wires that go to the connector.Typical stock Transports have around 25 nanosecond rise-times. The primary concern for the manufacturer is to pass FCC regulations for emissions and electromagnetic interference, as well as making the interface reliable. When the regulatory testing is done, they attach very inexpensive, inferior cables and measure the emissions. To insure that the manufacturer passes these tests, they take a number of precautions. One is designing-in the slower than necessary 25 nanosecond rise-time. Another is the insertion of various filters in the Transport to eliminate high frequencies from the signal. As a result of these choices, there is a hazard created in using too short a digital cable.It is a result of the slow rise-time. When a transition is launched into the cable, it takes a period of time to propagate or transit to the other end. This propagation time is somewhat slower than the speed of light, usually around 2 nanoseconds per foot, but can be longer depending on the dielectrics used in the digital cable. When the transition reaches the end of the transmission line (in the DAC), a reflection can occur that propagates back to the driver in the Transport. Small reflections can occur in even well matched systems. When the reflection reaches the driver, it can again be reflected back towards the DAC. This ping-pong effect can sustain itself for several bounces depending on the losses in the cable. It is not unusual to see 3-5 of these reflections before they finally decay away, particularly when using the best digital cables, which are usually low-loss. So, how does this affect the jitter? When the first reflection comes back to the DAC, if the transition already in process at the receiver has not completed, the reflection voltage will superimpose itself on the transition voltage, causing the transition to shift in time. The DAC will sample the transition in this time-shifted state and there you have jitter. Let’s look at a numerical example:If the rise-time is 25 nanoseconds and the cable length is 3 feet, then the propagation time is about 6 nanoseconds. Once the transition has arrived at the receiver, the reflection propagates back to the driver (6 nanoseconds) and then the driver reflects this back to the receiver (6 nanoseconds) = 12 nanoseconds. So, as seen at the receiver, 12 nanoseconds after the 25 nanosecond transition started, we have a reflection superimposing on the transition. This is right about the time that the receiver will try to sample the transition, right around 0 volts DC. Not good. Now if the cable had been 1.5 meters, the reflection would have arrived 18 nanoseconds after the 25 nanosecond transition started at the receiver. This is much better because the receiver has likely already sampled the transition by this time.

DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.

DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.

DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.

DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.

DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.

DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.

DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.

DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.

DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.

DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.

Nordost 75 Ohm Silver plated SPDIF cable - rare RCA - BNC ideal for CHORD, NAIM LINN DACs etc. as you can connect without using adaptors which compromise performance. This is a coaxial micro monofilament silver-plated 99.9999% OFC - 75 Ohm cable from one of the top brands in audio cables. (YES THAT IS SILVER PLATED 6 NINES OXYGEN FREE COPPER) The micro-monofilament is a plastic filler wires that spaces the silver plated conductor from the middle of the teflon tube, thus providing a mostly air dielectric - improving performance. ***Please see the feedback for these Nordost cables I have assembled, one customer bought one and then ordered two more he was so delighted with the performance with his NAIM equipment *** Brand new BNC connectors - Hicon (by Sommer of Germany) gold plated BNC and The RCA is the original also made by Hicon and labelled Nordost and is an unusual 75Ohm design. The cable is cut from a long length of used cable - but as you can see the distinctive two colour shield is shiny as is the centre conductor silver plated copper I have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, labelled orange for SPDIF, fully tested and burned in the cable.These cables were originally sold as 75 Ohm cables in a bundle of three for component video - manufacturers just sold a single version of the same cable for digital SPDIF. (The 75Ohm characteristic impedance specification for SPDIF and Component Video is identical) They are exactly the same cables just with different labels. This means you get a fabulous quality Nordost cable at a bargain price.n.b. The Chord Qutest is NOT included in the sale obviously! Length of cable – why 1.5m? Summary There are only two occasions in audio where a longer cable – or an optimum length cable is better than a short one. With Digital cables there is an optimum length of 1.5m or more. (The other occasion is for MM phono cartridges, which need a specific capacitance). The reason for this requires an explanation. Please refer to diagram in the photos. The signal travelling down a SPDIF (so called digital cable) is actually a square wave ANALOGUE voltage signal, however in reality this square does not have instantaneous changes - the squares are sloped and somewhat rounded off too as it takes some time to change state from 0 to 1 or 1 to 0. The accuracy of the pulses at the end of the cable determine how accurately the source can interpret the signal in value 1 or 0 and also timing which not so easy. The signal reflects back off the ends of the cable, the plugs and connected equipment (echoing back and forth) and produces ghost images of itself, which can fool the receiver into thinking that the “ghost” signals are the original signals. With short cables, under 1m, the ghost signals arrive close to the originals within the time frame of transition from 0 to 1 or 1 to 0, before the transition occurs. A 1m cable means the reflection arrives at about the same time as the transition is to be recorded. With longer cables the reflection arrives too late to influence the receiver (The transition has already been recorded). Longer cables also mean lower amplitude or signal reflection thus receiver can more easily determine between the correct signal and the spurious reflections. The bottom line as that a longer cable eliminates the false readings from the ghost images, and thus reduces timing errors, called jitter and thus sounds better. The optimum size has been determined by measurements and experimentation to be 1.5m or more. Detailed Technical Explanation for those with an enquiring mind. Why SPDIF cables should be 1.5m long. When the SPDIF signal is launched into the cable from the Transport, it is essentially a voltage square-wave, consisting of rising edges and falling edges. These edges are no more than transitions of voltage from about –250mV to +250mV, the rising edge transitioning from minus voltage to plus voltage and the falling edge transitioning from plus voltage to minus voltage. When an edge transitions, it can be described as having a rise-time or fall-time. This is the time it takes for the signal to transition from 10% to 90% of the entire voltage swing. (note that this DOES Not happen instantaneously) The rise-time is important because this is what causes reflections on the transmission-line. If the rise-time were very, very slow, say 50 nanoseconds, then there would be no reflections on the transmission-line unless it was extremely long. Alternately, if the rise-time were less than 1 nanosecond, reflections would occur at every boundary, such as the connection from the circuit board to the wires that go to the connector.Typical stock Transports have around 25 nanosecond rise-times. The primary concern for the manufacturer is to pass FCC regulations for emissions and electromagnetic interference, as well as making the interface reliable. When the regulatory testing is done, they attach very inexpensive, inferior cables and measure the emissions. To insure that the manufacturer passes these tests, they take a number of precautions. One is designing-in the slower than necessary 25 nanosecond rise-time. Another is the insertion of various filters in the Transport to eliminate high frequencies from the signal. As a result of these choices, there is a hazard created in using too short a digital cable.It is a result of the slow rise-time. When a transition is launched into the cable, it takes a period of time to propagate or transit to the other end. This propagation time is somewhat slower than the speed of light, usually around 2 nanoseconds per foot, but can be longer depending on the dielectrics used in the digital cable. When the transition reaches the end of the transmission line (in the DAC), a reflection can occur that propagates back to the driver in the Transport. Small reflections can occur in even well matched systems. When the reflection reaches the driver, it can again be reflected back towards the DAC. This ping-pong effect can sustain itself for several bounces depending on the losses in the cable. It is not unusual to see 3-5 of these reflections before they finally decay away, particularly when using the best digital cables, which are usually low-loss. So, how does this affect the jitter? When the first reflection comes back to the DAC, if the transition already in process at the receiver has not completed, the reflection voltage will superimpose itself on the transition voltage, causing the transition to shift in time. The DAC will sample the transition in this time-shifted state and there you have jitter. Let’s look at a numerical example:If the rise-time is 25 nanoseconds and the cable length is 3 feet, then the propagation time is about 6 nanoseconds. Once the transition has arrived at the receiver, the reflection propagates back to the driver (6 nanoseconds) and then the driver reflects this back to the receiver (6 nanoseconds) = 12 nanoseconds. So, as seen at the receiver, 12 nanoseconds after the 25 nanosecond transition started, we have a reflection superimposing on the transition. This is right about the time that the receiver will try to sample the transition, right around 0 volts DC. Not good. Now if the cable had been 1.5 meters, the reflection would have arrived 18 nanoseconds after the 25 nanosecond transition started at the receiver. This is much better because the receiver has likely already sampled the transition by this time.

Nordost 75 Ohm Silver plated SPDIF cable - rare RCA - BNC ideal for CHORD, NAIM LINN DACs etc. as you can connect without using adaptors which compromise performance. This is a coaxial micro monofilament silver-plated 99.9999% OFC - 75 Ohm cable from one of the top brands in audio cables. (YES THAT IS SILVER PLATED 6 NINES OXYGEN FREE COPPER) The micro-monofilament is a plastic filler wires that spaces the silver plated conductor from the middle of the teflon tube, thus providing a mostly air dielectric - improving performance. ***Please see the feedback for these Nordost cables I have assembled, one customer bought one and then ordered two more he was so delighted with the performance with his NAIM equipment *** Brand new RCA connector - Nordost Wyrewizard gold plated and The BNC is the original from the Nordost cable. The cable is cut from a long length of used cable - but as you can see the distinctive two colour shield is shiny as is the centre conductor silver plated copper I have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, labelled orange for SPDIF, fully tested and burned in the cable.These cables were originally sold as 75 Ohm cables in a bundle of three for component video - manufacturers just sold a single version of the same cable for digital SPDIF. (The 75Ohm characteristic impedance specification for SPDIF and Component Video is identical) They are exactly the same cables just with different labels. This means you get a fabulous quality Nordost cable at a bargain price.n.b. The Chord Qutest is NOT included in the sale obviously!

Nordost 75 Ohm Silver plated SPDIF cable - rare RCA - BNC ideal for CHORD, NAIM LINN DACs etc. as you can connect without using adaptors which compromise performance. This is a coaxial micro monofilament silver-plated 99.9999% OFC - 75 Ohm cable from one of the top brands in audio cables. (YES THAT IS SILVER PLATED 6 NINES OXYGEN FREE COPPER) The micro-monofilament is a plastic filler wires that spaces the silver plated conductor from the middle of the teflon tube, thus providing a mostly air dielectric - improving performance. ***Please see the feedback for these Nordost cables I have assembled, one customer bought one and then ordered two more he was so delighted with the performance with his NAIM equipment *** Brand new RCA connector - Nordost Wyrewizard gold plated and The BNC is the original from the Nordost cable. The cable is cut from a long length of used cable - but as you can see the distinctive two colour shield is shiny as is the centre conductor silver plated copper I have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, labelled orange for SPDIF, fully tested and burned in the cable.These cables were originally sold as 75 Ohm cables in a bundle of three for component video - manufacturers just sold a single version of the same cable for digital SPDIF. (The 75Ohm characteristic impedance specification for SPDIF and Component Video is identical) They are exactly the same cables just with different labels. This means you get a fabulous quality Nordost cable at a bargain price.n.b. The Chord Qutest is NOT included in the sale obviously!

This is one of the best 75Ohm cables ever made! Nordost 75 Ohm Silver HD SPDIF cable - rare RCA to BNC ideal for CHORD, NAIM LINN DACs etc. from CD transports/players or Streamers. This is a coaxial DUAL micro monofilament silver-plated 99.9999% OFC - 75 Ohm cable from one of the top brands in audio cables. (YES! THAT IS SILVER PLATED 6 NINES OXYGEN FREE COPPER) The dual micro-monofilaments are the two plastic filler wires that space the silver-plated conductor from the middle of the teflon tube, thus providing a mostly air dielectric - improving performance by reducing the dielectric effect which causes phase shift and jitter. Brand new connectors - Hicon (by Sommer of Germany) gold plated BNC and RCA Phono plug (This is the brand that supply Nordost with their connectors). The cable is cut from a long length of used cable - but as you can see the distinctive two-colour shield is shiny as is the centre conductor silver plated copper I have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, labelled orange for SPDIF, fully tested and burned in the cable. n.b. The Chord Qutest is NOT included in the sale obviously! Burn In 48 Hours burn in using the Tara Labs Cascade Burn in file – from their website…“The new CASCADE noise burn-in disc is a proprietary combination of white noise with frequency tone bursts and pink noise mixed at different levels. However, what makes it really effective is a series of descending and ascending (cascading) multi-octave square sweeps for better and more complete results than any other “burn-in” discs that have been made to date. The CASCADE noise burn-in disc may be used with audio electronic component and with audio cable including cables with attachments such as batteries or filter networks. Before and after results will be obvious with any of these cables.”

Nordost 75 Ohm Silver plated SPDIF cable - rare RCA - BNC or BNC to RCA Symmetrical cable. ideal for CHORD, NAIM LINN DACs etc. as you can connect without using adaptors which compromise performance by increasing reflections and causing jitter.   This is a coaxial micro monofilament silver-plated 99.9999% OFC -  75 Ohm cable from one of the top brands in audio cables.  (YES THAT IS SILVER PLATED 6 NINES OXYGEN FREE COPPER)   The micro-monofilament is a plastic filler wire that spaces the silver plated conductor from the middle of the teflon tube, thus providing a mostly air dielectric - improving performance.   ***Please see the feedback for these Nordost cables I have assembled, one customer bought one and then ordered two more he was so delighted with the performance with his NAIM equipment ***     Brand new BNC connectors - Hicon (by Sommer of Germany) gold plated BNC and The RCA is the original also made by Hicon (who supply Nordost) and is an unusual 75 Ohm design which reduces reflections and thus jitter. The cable is cut from a long length of used cable - but as you can see the distinctive two colour shield is shiny as is  the centre conductor silver plated copper I have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, labelled orange for SPDIF, fully tested and burned in the cable. These cables were originally sold as 75 Ohm cables in a bundle of three for component video - manufacturers just sold a single version of the same cable for digital SPDIF. (The 75Ohm characteristic impedance specification for SPDIF and Component Video is identical) They are exactly the same cables just with different labels. This means you get a fabulous quality Nordost cable at a bargain price. n.b. The Chord Qutest is NOT included in the sale obviously!     Length of cable – why 1.5m is the minimum length? Summary   There are only two occasions in audio where a longer cable – or an optimum length cable is better than a short one. With Digital cables there is an optimum length of 1.5m or more. (The other occasion is for MM phono cartridges, which need a specific capacitance).   The reason for this requires an explanation. Please refer to diagram in the photos.   The signal travelling down a SPDIF (so called digital cable) is actually a square wave ANALOGUE voltage signal, however in reality this square does not have instantaneous changes - the squares are sloped and somewhat rounded off too as it takes some time to change state from 0 to 1 or 1 to 0.  The accuracy of the pulses at the end of the cable determine how accurately the source can interpret the signal in value  1 or 0 and also timing which not so easy.   The signal reflects back off the ends of the cable, the plugs and connected equipment (echoing back and forth) and produces ghost images of itself, which can fool the receiver into thinking that the “ghost” signals are the original signals. With short cables, under 1m, the ghost signals arrive close to the originals within the time frame of transition from 0 to 1 or 1 to 0, before the transition occurs. A 1m cable means the reflection arrives at about the same time as the transition is to be recorded. With longer cables the reflection arrives too late to influence the receiver (The transition has already been recorded). Longer cables also mean lower amplitude or signal reflection thus receiver can more easily determine between the correct signal and the spurious reflections.   The bottom line as that a longer cable eliminates the false readings from the ghost images, and thus reduces timing errors, called jitter and thus sounds better.   The optimum size has been determined by measurements and experimentation to be 1.5m or more.       Detailed Technical Explanation for those with an enquiring mind.   Why SPDIF cables should be 1.5m long.   When the SPDIF signal is launched into the cable from the Transport, it is essentially a voltage square-wave, consisting of rising edges and falling edges. These edges are no more than transitions of voltage from about –250mV to +250mV, the rising edge transitioning from minus voltage to plus voltage and the falling edge transitioning from plus voltage to minus voltage. When an edge transitions, it can be described as having a rise-time or fall-time. This is the time it takes for the signal to transition from 10% to 90% of the entire voltage swing. (note that this DOES Not happen instantaneously)    The rise-time is important because this is what causes reflections on the transmission-line. If the rise-time were very, very slow, say 50 nanoseconds, then there would be no reflections on the transmission-line unless it was extremely long.  Alternately, if the rise-time were less than 1 nanosecond, reflections would occur at every boundary, such as the connection from the circuit board to the wires that go to the connector. Typical stock Transports have around 25 nanosecond rise-times. The primary concern for the manufacturer is to pass FCC regulations for emissions and electromagnetic interference, as well as making the interface reliable. When the regulatory testing is done, they attach very inexpensive, inferior cables and measure the emissions. To insure that the manufacturer passes these tests, they take a number of precautions. One is designing-in the slower than necessary 25 nanosecond rise-time. Another is the insertion of various filters in the Transport to eliminate high frequencies from the signal. As a result of these choices, there is a hazard created in using too short a digital cable.It is a result of the slow rise-time.    When a transition is launched into the cable, it takes a period of time to propagate or transit to the other end. This propagation time is somewhat slower than the speed of light, usually around 2 nanoseconds per foot, but can be longer depending on the dielectrics used in the digital cable. When the transition reaches the end of the transmission line (in the DAC), a reflection can occur that propagates back to the driver in the Transport. Small reflections can occur in even well matched systems. When the reflection reaches the driver, it can again be reflected back towards the DAC. This ping-pong effect can sustain itself for several bounces depending on the losses in the cable. It is not unusual to see 3-5 of these reflections before they finally decay away, particularly when using the best digital cables, which are usually low-loss.   So, how does this affect the jitter? When the first reflection comes back to the DAC, if the transition already in process at the receiver has not completed, the reflection voltage will superimpose itself on the transition voltage, causing the transition to shift in time. The DAC will sample the transition in this time-shifted state and there you have jitter.    Let’s look at a numerical example: If the rise-time is 25 nanoseconds and the cable length is 3 feet, then the propagation time is about 6 nanoseconds. Once the transition has arrived at the receiver, the reflection propagates back to the driver (6 nanoseconds) and then the driver reflects this back to the receiver (6 nanoseconds) = 12 nanoseconds. So, as seen at the receiver, 12 nanoseconds after the 25 nanosecond transition started, we have a reflection superimposing on the transition. This is right about the time that the receiver will try to sample the transition, right around 0 volts DC. Not good. Now if the cable had been 1.5 meters, the reflection would have arrived 18 nanoseconds after the 25 nanosecond transition started at the receiver. This is much better because the receiver has likely already sampled the transition by this time.      

Nordost 75 Ohm Silver HD SPDIF cable - rare RCA to BNC ideal for CHORD, NAIM LINN DACs etc. Tested with the Chord DAVE and Qutest.This is a coaxial DUAL micro monofilament silver-plated 99.9999% OFC - 75 Ohm cable from one of the top brands in audio cables. (YES, THAT IS SILVER-PLATED 6 NINES OXYGEN FREE COPPER) The dual micro-monofilaments are the two plastic filler wires that space the silver-plated conductor from the middle of the FEP tube, thus providing a mostly air dielectric - improving performance. Brand new connectors - Hicon (by Sommer of Germany) gold plated BNC (This is the connector manufacturer that Nordost use). - The cable is cut from a longer length of used cable - but as you can see, the distinctive two-colour shield is shiny, as is the centre conductor silver plated copper I have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, labelled orange for SPDIF, thoroughly tested and burned in the cable.These cables were originally sold as 75 Ohm cables in a bundle of three for component video - manufacturers just sold a single version of the same cable for digital SPDIF. (They specification for SPDIF and Component Video is identical) They are exactly the same just with different labels. This means you get a fabulous quality Nordost cable at a bargain price.n.b. The Chord Qutest is NOT included in the sale obviously!1.5m is the minimum length that an SPDIF cable should be – see explanation below. From Nordost This new design introduces more air space between the conductor and the FEP insulation reducing dielectric contact by more than 85%. The result is a cable with much lower capacitance and resistance, resulting in higher signal speed and resolution. Why SPDIF cables should be 1.5m long.· When the SPDIF signal is launched into the cable from the Transport, it is essentially a voltage square wave consisting of rising edges and falling edges. These edges are no more than voltage transitions from about –250mV to +250mV, the rising edge transitioning from minus voltage to plus voltage, and the falling edge transitioning from plus voltage to minus voltage. When an edge transitions, it can be described as having a rise-time or fall time. This is the time for the signal to transition from 10% to 90% of the entire voltage swing. (note that this DOES Not happen instantaneously) · The rise time is important because this causes reflections on the transmission-line. If the rise time were very slow, say 50 nanoseconds, then there would be no reflections on the transmission-line unless it was extremely long. · Alternately, if the rise-time were less than 1 nanosecond, reflections would occur at every boundary, such as the connection from the circuit board to the wires that go to the connector.· Typical stock Transports have around 25 nanosecond rise times. The primary concern for the manufacturer is to pass FCC regulations for emissions and electromagnetic interference and make the interface reliable. When the regulatory testing is done, they attach very inexpensive, inferior cables and measure the emissions. To insure that the manufacturer passes these tests, they take several precautions. One is designing in the slower than necessary 25 nanosecond rise-time. Another is inserting various filters in the Transport to eliminate high frequencies from the signal. As a result of these choices, there is a hazard created by using too short a digital cable. It is a result of the slow rise time. · When a transition is launched into the cable, it takes a period of time to propagate or transmit to the other end. This propagation time is somewhat slower than the speed of light, usually around 2 nanoseconds per foot, but can be longer depending on the dielectrics used in the digital cable. When the transition reaches the end of the transmission line (in the DAC), a reflection can occur that propagates back to the driver in the Transport. Small reflections can occur in even well matched systems. When the reflection reaches the driver, it can again be reflected back toward the DAC. This ping-pong effect can sustain itself for several bounces depending on the losses in the cable. It is not unusual to see 3-5 of these reflections before they finally decay away, particularly when using the best digital cables, which are usually low-loss.· So, how does this affect the jitter? When the first reflection returns to the DAC, if the transition already in process at the receiver has not been completed, the reflection voltage will superimpose itself on the transition voltage, causing the transition to shift in time. The DAC will sample the transition in this time-shifted state, and there you have jitter. · Let’s look at a numerical example:· If the rise time is 25 nanoseconds and the cable length is 3 feet, then the propagation time is about 6 nanoseconds. Once the transition has arrived at the receiver, the reflection propagates back to the driver (6 nanoseconds), and then the driver reflects this back to the receiver (6 nanoseconds) = 12 nanoseconds. So, as seen at the receiver, 12 nanoseconds after the 25 nanosecond transition started, we have a reflection superimposing on the transition. This is right about the time that the receiver will try to sample the transition, right around 0 volts DC. Not good. Now if the cable had been 1.5 meters, the reflection would have arrived 18 nanoseconds after the 25 nanosecond transition started at the receiver. This is much better because the receiver has likely already sampled the transition by this time. Burn In 48 Hours burn in using the Tara Labs Cascade Burn in file – from their website…“The new CASCADE noise burn-in disc is a proprietary combination of white noise with frequency tone bursts and pink noise mixed at different levels. However, what makes it effective is a series of descending and ascending (cascading) multi-octave square sweeps for better and more complete results than any other “burn-in” discs that have been made to date. The CASCADE noise burn-in disc may be used with an audio electronic component and with an audio cable, including cables with attachments such as batteries or filter networks. Before and after results will be obvious with any of these cables.”

Nordost 75 Ohm Silver plated SPDIF cable - rare RCA - BNC with an extra layer of shielding and carefully chosen high frequency ferrite noise cancelling beads. Ideal for CHORD, NAIM LINN DACs etc. as you can connect without using adaptors which compromise performance. The extra layer of shielding and two ferrite plus labour adds only £20 to the price of the standard cable. (Which is also still available). Certainly worth it if sound quality is your main consideration. Tested on the Chord Dave and Qutest. This is a coaxial micro monofilament silver-plated 99.9999% OFC - 75 Ohm cable from one of the top brands in audio cables. (YES THAT IS SILVER PLATED 6 NINES OXYGEN FREE COPPER) The micro-monofilament is a plastic filler wires that spaces the silver plated conductor from the middle of the teflon tube, thus providing a mostly air dielectric - improving performance. ***Please see the feedback for these Nordost cables I have assembled, one customer bought one and then ordered two more he was so delighted with the performance with his NAIM equipment *** Brand new BNC connectors - Hicon (by Sommer of Germany) gold plated BNC and The RCA is the original also made by Hicon and labelled Nordost and is an unusual 75Ohm design. The cable is cut from a long length of used cable - but as you can see the distinctive two colour shield is shiny as is the centre conductor silver plated copper I have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, labelled orange for SPDIF, fully tested and burned in the cable.These cables were originally sold as 75 Ohm cables in a bundle of three for component video - manufacturers just sold a single version of the same cable for digital SPDIF. (The 75Ohm characteristic impedance specification for SPDIF and Component Video is identical) They are exactly the same cables just with different labels. This means you get a fabulous quality Nordost cable at a bargain price.n.b. The Chord Qutest is NOT included in the sale obviously! Length of cable – why 1.5m? Summary There are only two occasions in audio where a longer cable – or an optimum length cable is better than a short one. With Digital cables there is an optimum length of 1.5m or more. (The other occasion is for MM phono cartridges, which need a specific capacitance). The reason for this requires an explanation. Please refer to diagram in the photos. The signal travelling down a SPDIF (so called digital cable) is actually a square wave ANALOGUE voltage signal, however in reality this square does not have instantaneous changes - the squares are sloped and somewhat rounded off too as it takes some time to change state from 0 to 1 or 1 to 0. The accuracy of the pulses at the end of the cable determine how accurately the source can interpret the signal in value 1 or 0 and also timing which not so easy. The signal reflects back off the ends of the cable, the plugs and connected equipment (echoing back and forth) and produces ghost images of itself, which can fool the receiver into thinking that the “ghost” signals are the original signals. With short cables, under 1m, the ghost signals arrive close to the originals within the time frame of transition from 0 to 1 or 1 to 0, before the transition occurs. A 1m cable means the reflection arrives at about the same time as the transition is to be recorded. With longer cables the reflection arrives too late to influence the receiver (The transition has already been recorded). Longer cables also mean lower amplitude or signal reflection thus receiver can more easily determine between the correct signal and the spurious reflections. The bottom line as that a longer cable eliminates the false readings from the ghost images, and thus reduces timing errors, called jitter and thus sounds better. The optimum size has been determined by measurements and experimentation to be 1.5m or more. Detailed Technical Explanation for those with an enquiring mind. Why SPDIF cables should be 1.5m long. When the SPDIF signal is launched into the cable from the Transport, it is essentially a voltage square-wave, consisting of rising edges and falling edges. These edges are no more than transitions of voltage from about –250mV to +250mV, the rising edge transitioning from minus voltage to plus voltage and the falling edge transitioning from plus voltage to minus voltage. When an edge transitions, it can be described as having a rise-time or fall-time. This is the time it takes for the signal to transition from 10% to 90% of the entire voltage swing. (note that this DOES Not happen instantaneously) The rise-time is important because this is what causes reflections on the transmission-line. If the rise-time were very, very slow, say 50 nanoseconds, then there would be no reflections on the transmission-line unless it was extremely long. Alternately, if the rise-time were less than 1 nanosecond, reflections would occur at every boundary, such as the connection from the circuit board to the wires that go to the connector.Typical stock Transports have around 25 nanosecond rise-times. The primary concern for the manufacturer is to pass FCC regulations for emissions and electromagnetic interference, as well as making the interface reliable. When the regulatory testing is done, they attach very inexpensive, inferior cables and measure the emissions. To insure that the manufacturer passes these tests, they take a number of precautions. One is designing-in the slower than necessary 25 nanosecond rise-time. Another is the insertion of various filters in the Transport to eliminate high frequencies from the signal. As a result of these choices, there is a hazard created in using too short a digital cable.It is a result of the slow rise-time. When a transition is launched into the cable, it takes a period of time to propagate or transit to the other end. This propagation time is somewhat slower than the speed of light, usually around 2 nanoseconds per foot, but can be longer depending on the dielectrics used in the digital cable. When the transition reaches the end of the transmission line (in the DAC), a reflection can occur that propagates back to the driver in the Transport. Small reflections can occur in even well matched systems. When the reflection reaches the driver, it can again be reflected back towards the DAC. This ping-pong effect can sustain itself for several bounces depending on the losses in the cable. It is not unusual to see 3-5 of these reflections before they finally decay away, particularly when using the best digital cables, which are usually low-loss. So, how does this affect the jitter? When the first reflection comes back to the DAC, if the transition already in process at the receiver has not completed, the reflection voltage will superimpose itself on the transition voltage, causing the transition to shift in time. The DAC will sample the transition in this time-shifted state and there you have jitter. Let’s look at a numerical example:If the rise-time is 25 nanoseconds and the cable length is 3 feet, then the propagation time is about 6 nanoseconds. Once the transition has arrived at the receiver, the reflection propagates back to the driver (6 nanoseconds) and then the driver reflects this back to the receiver (6 nanoseconds) = 12 nanoseconds. So, as seen at the receiver, 12 nanoseconds after the 25 nanosecond transition started, we have a reflection superimposing on the transition. This is right about the time that the receiver will try to sample the transition, right around 0 volts DC. Not good. Now if the cable had been 1.5 meters, the reflection would have arrived 18 nanoseconds after the 25 nanosecond transition started at the receiver. This is much better because the receiver has likely already sampled the transition by this time.

Excellent Nordost 75Ohm cable with the original and hard to find Nordost (actually Hicon) 75 Ohm RCA and a new Hicon BNC Ideal for all CHORD DACs such as the Qutest, TT2, and DAVE, tested with Qutest and DAVE during design, each individually tested and burned in using the Qutest before being shipped. Also suitable for Linn, NAIM etc with BNC fittings. Silver-plated, 99.999% oxygen-free copper, single monofilament solid core mostly air dielectric within a teflon tube and true 75 Ohm construction. Mint condition cable, Nordost (Hicon) 75 Ohm RCA plugs with Hicon gold plated 75 Ohm BNC plugs Unusual and hard to find RCAs are closest I have seen to a true 75Ohm RCA plug.Assembled by hand in the UK.Digital SPDIF cable to connect CD / digital player or streamer to DAC. 1.1m RCA to BNC.Burned in using the Tara Labs Cascade file. Please see the excellent 100% feedback I have received for hundreds of digital and analogue cables.

Nordost 75 Ohm Silver plated SPDIF cable - rare RCA - BNC ideal for CHORD, NAIM LINN DACs etc. as you can connect without using adaptors which compromise performance. This is a coaxial micro monofilament silver-plated 99.9999% OFC - 75 Ohm cable from one of the top brands in audio cables. (YES THAT IS SILVER PLATED 6 NINES OXYGEN FREE COPPER) The micro-monofilament is a plastic filler wires that spaces the silver plated conductor from the middle of the teflon tube, thus providing a mostly air dielectric - improving performance. ***Please see the feedback for these Nordost cables I have assembled, one customer bought one and then ordered two more he was so delighted with the performance with his NAIM equipment *** Brand new BNC connectors - Hicon (by Sommer of Germany) gold plated BNC and The RCA is the original also made by Hicon and labelled Nordost and is an unusual 75Ohm design. The cable is cut from a long length of used cable - but as you can see the distinctive two colour shield is shiny as is the centre conductor silver plated copper I have repackaged the cable, improved the strain relief, treated the connectors with Deoxit, labelled orange for SPDIF, fully tested and burned in the cable.These cables were originally sold as 75 Ohm cables in a bundle of three for component video - manufacturers just sold a single version of the same cable for digital SPDIF. (The 75Ohm characteristic impedance specification for SPDIF and Component Video is identical) They are exactly the same cables just with different labels. This means you get a fabulous quality Nordost cable at a bargain price.n.b. The Chord Qutest is NOT included in the sale obviously! Length of cable – why 1.5m is the minimum length for SPDIF? Summary There are only two occasions in audio where a longer cable – or an optimum length cable is better than a short one. With Digital cables there is an optimum length of 1.5m or more. (The other occasion is for MM phono cartridges, which need a specific capacitance). The reason for this requires an explanation. Please refer to diagram in the photos. The signal travelling down a SPDIF (so called digital cable) is actually a square wave ANALOGUE voltage signal, however in reality this square does not have instantaneous changes - the squares are sloped and somewhat rounded off too as it takes some time to change state from 0 to 1 or 1 to 0. The accuracy of the pulses at the end of the cable determine how accurately the source can interpret the signal in value 1 or 0 and also timing which not so easy. The signal reflects back off the ends of the cable, the plugs and connected equipment (echoing back and forth) and produces ghost images of itself, which can fool the receiver into thinking that the “ghost” signals are the original signals. With short cables, under 1m, the ghost signals arrive close to the originals within the time frame of transition from 0 to 1 or 1 to 0, before the transition occurs. A 1m cable means the reflection arrives at about the same time as the transition is to be recorded. With longer cables the reflection arrives too late to influence the receiver (The transition has already been recorded). Longer cables also mean lower amplitude or signal reflection thus receiver can more easily determine between the correct signal and the spurious reflections. The bottom line as that a longer cable eliminates the false readings from the ghost images, and thus reduces timing errors, called jitter and thus sounds better. The optimum size has been determined by measurements and experimentation to be 1.5m or more. Detailed Technical Explanation for those with an enquiring mind. Why SPDIF cables should be 1.5m long. When the SPDIF signal is launched into the cable from the Transport, it is essentially a voltage square-wave, consisting of rising edges and falling edges. These edges are no more than transitions of voltage from about –250mV to +250mV, the rising edge transitioning from minus voltage to plus voltage and the falling edge transitioning from plus voltage to minus voltage. When an edge transitions, it can be described as having a rise-time or fall-time. This is the time it takes for the signal to transition from 10% to 90% of the entire voltage swing. (note that this DOES Not happen instantaneously) The rise-time is important because this is what causes reflections on the transmission-line. If the rise-time were very, very slow, say 50 nanoseconds, then there would be no reflections on the transmission-line unless it was extremely long. Alternately, if the rise-time were less than 1 nanosecond, reflections would occur at every boundary, such as the connection from the circuit board to the wires that go to the connector.Typical stock Transports have around 25 nanosecond rise-times. The primary concern for the manufacturer is to pass FCC regulations for emissions and electromagnetic interference, as well as making the interface reliable. When the regulatory testing is done, they attach very inexpensive, inferior cables and measure the emissions. To insure that the manufacturer passes these tests, they take a number of precautions. One is designing-in the slower than necessary 25 nanosecond rise-time. Another is the insertion of various filters in the Transport to eliminate high frequencies from the signal. As a result of these choices, there is a hazard created in using too short a digital cable.It is a result of the slow rise-time. When a transition is launched into the cable, it takes a period of time to propagate or transit to the other end. This propagation time is somewhat slower than the speed of light, usually around 2 nanoseconds per foot, but can be longer depending on the dielectrics used in the digital cable. When the transition reaches the end of the transmission line (in the DAC), a reflection can occur that propagates back to the driver in the Transport. Small reflections can occur in even well matched systems. When the reflection reaches the driver, it can again be reflected back towards the DAC. This ping-pong effect can sustain itself for several bounces depending on the losses in the cable. It is not unusual to see 3-5 of these reflections before they finally decay away, particularly when using the best digital cables, which are usually low-loss. So, how does this affect the jitter? When the first reflection comes back to the DAC, if the transition already in process at the receiver has not completed, the reflection voltage will superimpose itself on the transition voltage, causing the transition to shift in time. The DAC will sample the transition in this time-shifted state and there you have jitter. Let’s look at a numerical example:If the rise-time is 25 nanoseconds and the cable length is 3 feet, then the propagation time is about 6 nanoseconds. Once the transition has arrived at the receiver, the reflection propagates back to the driver (6 nanoseconds) and then the driver reflects this back to the receiver (6 nanoseconds) = 12 nanoseconds. So, as seen at the receiver, 12 nanoseconds after the 25 nanosecond transition started, we have a reflection superimposing on the transition. This is right about the time that the receiver will try to sample the transition, right around 0 volts DC. Not good. Now if the cable had been 1.5 meters, the reflection would have arrived 18 nanoseconds after the 25 nanosecond transition started at the receiver. This is much better because the receiver has likely already sampled the transition by this time.