I am selling my 2 March P451 amplifiers. They are in perfect visual and working condition. I am parting ways with them as I have reconfigured my home theater system. As a serial owner of Class-D amplifiers (Bel Canto, Audiophonics), they are right up there at the top. Very fast, extremely clean, dead quiet. March has taken the baseline Purifi 1ET400A and added their own input and power supply. Efficient enough (.2w standby) that you can leave them on all the time or use the 12v trigger. Very small and compact, plus extremely cool running, so they easily fit in even tight fitting stero racks yet look good enough to be freestanding. I have all original March packaging included. Details and description from the manufacturer:The P451 (model now known as P421)is a Purifi based monoblock power amplifier. This simply elegant product is milled from solid aluminum with a tough anodized treatment. Exceptional fit, finish and build quality. The differential (balanced) input buffer has been designed to extract the maximum performance from the Purifi module, minimize noise and eliminate ground loops. Featuring Neutrik XLR input connectors, 4 layer circuit board, OPA1612 op amps and very low noise LT3045/94 voltage regulators. The ETI Research Kryo speaker posts are manufactured from Tellurium Copper with Silver plating for superior conductivity and long lasting durability. The monoblock design has the advantage of eliminating all forms of crosstalk. The P421 features a lower noise input buffer compared to the stereo version. The new main power supply is custom designed and a significant improvement over the Hypex unit seen elsewhere. It is significantly oversized, has very low noise with high current output and excellent voltage regulation. Efficiency is improved with power factor correction. ?Power Output2 Ohms – 580 W rms?4 Ohms – 425 W rms8 Ohms – 227 W rmsCurrent Output – 25 AmpsTHD + N – 0.00018% / -115dB @ 100 Watts, 4 Ohms, 20Hz-20kHzOutput Noise – 16uVSignal To Noise Ratio – 129 dB(A)

Passive Radiator Passiv Membran, Papier Fiber Mix

2 x Purifi 1et400a Amplifier with VTV Sparkos 2590 Op Amp Pro Buffers. Bought for an amplifier project I never had the time to finish. Only needs a case and power supply to finish.

Boxem Purifi Amplifier. 2x Purifi Eigentakt Amps 2 channels power amplifier Ultra Clean Opamp OPA1656 Buffer Audio sense: automatic on/off switching 3 Gain Settings by switch on rear Purifi Eigentakt technology RRP 1750 + delivery (plus waiting list) Super low power consumption The best performance to price ratio power amp available today. Outperforms units costing thousands more. Unbelievable measurements. Pure, clean power. Mint condition. Only 8 months old. Original box and packaging. Handled once (to place on shelf) Stunning sound quality. Tons of power. Incredible control. Universally glowing reviews. Exceptional measurements. Black/gunmetal case. The very highest build quality Ive ever seen. Sale due to switching to active monitors. See Audio Science Review here: https://www.audiosciencereview.com/forum/index.php?threads/boxem-arthur-4222-e1-amplifier-review.37930/ Google Purifi Eigentakt for various reviews of the Purifi board. Purifi Eigentakt technology For Arthur 4215/E2 we have chosen to implement the Purifi Eigentakt technology. Purifi is the first company to have managed to build a mathematically exact model for self-oscillating amplifiers. This innovation enables a complete optimization of the amplification circuits improving the performance by an order of magnitude over existing implementations. In more musical terms: - Highly resolved and stable stereo image across the whole spectrum, even during very complex and busy passages thanks to the negligible inter-modulation distortion (IMD). - A total lack of sonic signature, and an ability to reproduce any type of music without preference for genre or production style due to the extremely low THD at any frequency and any power level. - Difficult loudspeakers are handled with ease, including those that challenge most other amplifiers because of the load-invariant frequency response and negligible output impedance. - The smallest amount of audible artifacts when pushed into clipping or overload is guaranteed by an exceptionally clean clipping and clipping-recovery in both voltage and current domains. In Arthur 4215/E2, the amplification stage can deliver up to 210 W in 8 and 450 W in 2 Input buffer with boXem sauce Arthur 4215/E2 input buffer board was designed in-house. The challenge has been to fit in a relatively limited space the buffer circuits for two channels, the gain management switch, the audio sense circuit, the I2C bus communication with the amplifiers and finally the supplies for analog and digital circuits, all this while obtaining the performance at the same level as the amplification modules. OPA1656 op-amps were chosen because of their immaculate performance and the extremely low DC offset allowed by their architecture. Three levels gain setting A switch on the rear of the amplifier allows you to set three different levels of gain. Depending on the output capability of your source (pre-amplifier or DAC with volume control) the system gain structure can be optimized for two main targets. The first is to have the lowest noise, the second the smoothest volume setting as possible. High gain is optimized for sources outputting 2V, medium for 4V, low for gear able to provide 10 V. While the noise levels of modern audio gear has become so low that noise optimization for home audio is often purely academic, having a smooth volume control is something we find so enjoyable that it was our main motivation for integrating the gain control switch. Beautiful chassis, attractive finish The full aluminum custom chassis is not only nice looking, it dissipates the heat of the amplification module. No screws are visible from front, top and sides. The front plate is machined in an aluminum block and spray painted with different colors that can be chosen while ordering. The top and sides cover is a single piece finished with a special paint, with a mate, suede-like texture providing avery qualitative look and feel. Listen to the music, forget the electronics Plug your audio source (with volume control), your speakers, the mains cable, switch on the mains, and forget your amplifier. The automatic on/off function detects the presence of sound at the input and automatically powers on the amplifier. After 10 minutes without sound at the input, the amplifier sets itself in standby, allowing an ultra low power consumption when not in use. Fully protected A full set of fault diagnostics allows to protect the amplifier and your speakers against abnormalities. Designed and proudly built in Luxembourg Arthur 4215/E2 was designed and is assembled at Schifflange, Luxembourg, at the heart of Europe.

Boxem Purifi Amplifier. 2x Purifi Eigentakt Amps 2 channels power amplifier Ultra Clean Opamp OPA1656 Buffer Audio sense: automatic on/off switching 3 Gain Settings by switch on rear Purifi Eigentakt technology RRP 1750 + delivery (plus waiting list) Super low power consumption The best performance to price ratio power amp available today. Outperforms units costing thousands more. Unbelievable measurements. Pure, clean power. Mint condition. Only 8 months old. Original box and packaging. Handled once (to place on shelf) Stunning sound quality. Tons of power. Incredible control. Universally glowing reviews. Exceptional measurements. Black/gunmetal case. The very highest build quality Ive ever seen. Sale due to switching to active monitors. See Audio Science Review here: https://www.audiosciencereview.com/forum/index.php?threads/boxem-arthur-4222-e1-amplifier-review.37930/ Google Purifi Eigentakt for various reviews of the Purifi board. Purifi Eigentakt technology For Arthur 4215/E2 we have chosen to implement the Purifi Eigentakt technology. Purifi is the first company to have managed to build a mathematically exact model for self-oscillating amplifiers. This innovation enables a complete optimization of the amplification circuits improving the performance by an order of magnitude over existing implementations. In more musical terms: - Highly resolved and stable stereo image across the whole spectrum, even during very complex and busy passages thanks to the negligible inter-modulation distortion (IMD). - A total lack of sonic signature, and an ability to reproduce any type of music without preference for genre or production style due to the extremely low THD at any frequency and any power level. - Difficult loudspeakers are handled with ease, including those that challenge most other amplifiers because of the load-invariant frequency response and negligible output impedance. - The smallest amount of audible artifacts when pushed into clipping or overload is guaranteed by an exceptionally clean clipping and clipping-recovery in both voltage and current domains. In Arthur 4215/E2, the amplification stage can deliver up to 210 W in 8 and 450 W in 2 Input buffer with boXem sauce Arthur 4215/E2 input buffer board was designed in-house. The challenge has been to fit in a relatively limited space the buffer circuits for two channels, the gain management switch, the audio sense circuit, the I2C bus communication with the amplifiers and finally the supplies for analog and digital circuits, all this while obtaining the performance at the same level as the amplification modules. OPA1656 op-amps were chosen because of their immaculate performance and the extremely low DC offset allowed by their architecture. Three levels gain setting A switch on the rear of the amplifier allows you to set three different levels of gain. Depending on the output capability of your source (pre-amplifier or DAC with volume control) the system gain structure can be optimized for two main targets. The first is to have the lowest noise, the second the smoothest volume setting as possible. High gain is optimized for sources outputting 2V, medium for 4V, low for gear able to provide 10 V. While the noise levels of modern audio gear has become so low that noise optimization for home audio is often purely academic, having a smooth volume control is something we find so enjoyable that it was our main motivation for integrating the gain control switch. Beautiful chassis, attractive finish The full aluminum custom chassis is not only nice looking, it dissipates the heat of the amplification module. No screws are visible from front, top and sides. The front plate is machined in an aluminum block and spray painted with different colors that can be chosen while ordering. The top and sides cover is a single piece finished with a special paint, with a mate, suede-like texture providing avery qualitative look and feel. Listen to the music, forget the electronics Plug your audio source (with volume control), your speakers, the mains cable, switch on the mains, and forget your amplifier. The automatic on/off function detects the presence of sound at the input and automatically powers on the amplifier. After 10 minutes without sound at the input, the amplifier sets itself in standby, allowing an ultra low power consumption when not in use. Fully protected A full set of fault diagnostics allows to protect the amplifier and your speakers against abnormalities. Designed and proudly built in Luxembourg Arthur 4215/E2 was designed and is assembled at Schifflange, Luxembourg, at the heart of Europe.

Boxem Purifi Amplifier. 2x Purifi Eigentakt Amps 2 channels power amplifier Ultra Clean Opamp OPA1656 Buffer Audio sense: automatic on/off switching 3 Gain Settings by switch on rear Purifi Eigentakt technology RRP 1750 + delivery (plus waiting list) Super low power consumption The best performance to price ratio power amp available today. Outperforms units costing thousands more. Unbelievable measurements. Pure, clean power. Mint condition. Only 8 months old. Original box and packaging. Handled once (to place on shelf) Stunning sound quality. Tons of power. Incredible control. Universally glowing reviews. Exceptional measurements. Black/gunmetal case. The very highest build quality Ive ever seen. Sale due to switching to active monitors. See Audio Science Review here: https://www.audiosciencereview.com/forum/index.php?threads/boxem-arthur-4222-e1-amplifier-review.37930/ Google Purifi Eigentakt for various reviews of the Purifi board. Purifi Eigentakt technology For Arthur 4215/E2 we have chosen to implement the Purifi Eigentakt technology. Purifi is the first company to have managed to build a mathematically exact model for self-oscillating amplifiers. This innovation enables a complete optimization of the amplification circuits improving the performance by an order of magnitude over existing implementations. In more musical terms: - Highly resolved and stable stereo image across the whole spectrum, even during very complex and busy passages thanks to the negligible inter-modulation distortion (IMD). - A total lack of sonic signature, and an ability to reproduce any type of music without preference for genre or production style due to the extremely low THD at any frequency and any power level. - Difficult loudspeakers are handled with ease, including those that challenge most other amplifiers because of the load-invariant frequency response and negligible output impedance. - The smallest amount of audible artifacts when pushed into clipping or overload is guaranteed by an exceptionally clean clipping and clipping-recovery in both voltage and current domains. In Arthur 4215/E2, the amplification stage can deliver up to 210 W in 8 and 450 W in 2 Input buffer with boXem sauce Arthur 4215/E2 input buffer board was designed in-house. The challenge has been to fit in a relatively limited space the buffer circuits for two channels, the gain management switch, the audio sense circuit, the I2C bus communication with the amplifiers and finally the supplies for analog and digital circuits, all this while obtaining the performance at the same level as the amplification modules. OPA1656 op-amps were chosen because of their immaculate performance and the extremely low DC offset allowed by their architecture. Three levels gain setting A switch on the rear of the amplifier allows you to set three different levels of gain. Depending on the output capability of your source (pre-amplifier or DAC with volume control) the system gain structure can be optimized for two main targets. The first is to have the lowest noise, the second the smoothest volume setting as possible. High gain is optimized for sources outputting 2V, medium for 4V, low for gear able to provide 10 V. While the noise levels of modern audio gear has become so low that noise optimization for home audio is often purely academic, having a smooth volume control is something we find so enjoyable that it was our main motivation for integrating the gain control switch. Beautiful chassis, attractive finish The full aluminum custom chassis is not only nice looking, it dissipates the heat of the amplification module. No screws are visible from front, top and sides. The front plate is machined in an aluminum block and spray painted with different colors that can be chosen while ordering. The top and sides cover is a single piece finished with a special paint, with a mate, suede-like texture providing avery qualitative look and feel. Listen to the music, forget the electronics Plug your audio source (with volume control), your speakers, the mains cable, switch on the mains, and forget your amplifier. The automatic on/off function detects the presence of sound at the input and automatically powers on the amplifier. After 10 minutes without sound at the input, the amplifier sets itself in standby, allowing an ultra low power consumption when not in use. Fully protected A full set of fault diagnostics allows to protect the amplifier and your speakers against abnormalities. Designed and proudly built in Luxembourg Arthur 4215/E2 was designed and is assembled at Schifflange, Luxembourg, at the heart of Europe.

Boxem Purifi Amplifier. 2x Purifi Eigentakt Amps 2 channels power amplifier Ultra Clean Opamp OPA1656 Buffer Audio sense: automatic on/off switching 3 Gain Settings by switch on rear Purifi Eigentakt technology RRP 1750 + delivery (plus waiting list) Super low power consumption The best performance to price ratio power amp available today. Outperforms units costing thousands more. Unbelievable measurements. Pure, clean power. Mint condition. Only 8 months old. Original box and packaging. Handled once (to place on shelf) Stunning sound quality. Tons of power. Incredible control. Universally glowing reviews. Exceptional measurements. Black/gunmetal case. The very highest build quality Ive ever seen. Sale due to switching to active monitors. See Audio Science Review here: https://www.audiosciencereview.com/forum/index.php?threads/boxem-arthur-4222-e1-amplifier-review.37930/ Google Purifi Eigentakt for various reviews of the Purifi board. Purifi Eigentakt technology For Arthur 4215/E2 we have chosen to implement the Purifi Eigentakt technology. Purifi is the first company to have managed to build a mathematically exact model for self-oscillating amplifiers. This innovation enables a complete optimization of the amplification circuits improving the performance by an order of magnitude over existing implementations. In more musical terms: - Highly resolved and stable stereo image across the whole spectrum, even during very complex and busy passages thanks to the negligible inter-modulation distortion (IMD). - A total lack of sonic signature, and an ability to reproduce any type of music without preference for genre or production style due to the extremely low THD at any frequency and any power level. - Difficult loudspeakers are handled with ease, including those that challenge most other amplifiers because of the load-invariant frequency response and negligible output impedance. - The smallest amount of audible artifacts when pushed into clipping or overload is guaranteed by an exceptionally clean clipping and clipping-recovery in both voltage and current domains. In Arthur 4215/E2, the amplification stage can deliver up to 210 W in 8 and 450 W in 2 Input buffer with boXem sauce Arthur 4215/E2 input buffer board was designed in-house. The challenge has been to fit in a relatively limited space the buffer circuits for two channels, the gain management switch, the audio sense circuit, the I2C bus communication with the amplifiers and finally the supplies for analog and digital circuits, all this while obtaining the performance at the same level as the amplification modules. OPA1656 op-amps were chosen because of their immaculate performance and the extremely low DC offset allowed by their architecture. Three levels gain setting A switch on the rear of the amplifier allows you to set three different levels of gain. Depending on the output capability of your source (pre-amplifier or DAC with volume control) the system gain structure can be optimized for two main targets. The first is to have the lowest noise, the second the smoothest volume setting as possible. High gain is optimized for sources outputting 2V, medium for 4V, low for gear able to provide 10 V. While the noise levels of modern audio gear has become so low that noise optimization for home audio is often purely academic, having a smooth volume control is something we find so enjoyable that it was our main motivation for integrating the gain control switch. Beautiful chassis, attractive finish The full aluminum custom chassis is not only nice looking, it dissipates the heat of the amplification module. No screws are visible from front, top and sides. The front plate is machined in an aluminum block and spray painted with different colors that can be chosen while ordering. The top and sides cover is a single piece finished with a special paint, with a mate, suede-like texture providing avery qualitative look and feel. Listen to the music, forget the electronics Plug your audio source (with volume control), your speakers, the mains cable, switch on the mains, and forget your amplifier. The automatic on/off function detects the presence of sound at the input and automatically powers on the amplifier. After 10 minutes without sound at the input, the amplifier sets itself in standby, allowing an ultra low power consumption when not in use. Fully protected A full set of fault diagnostics allows to protect the amplifier and your speakers against abnormalities. Designed and proudly built in Luxembourg Arthur 4215/E2 was designed and is assembled at Schifflange, Luxembourg, at the heart of Europe.

Boxem Purifi Amplifier. 2x Purifi Eigentakt Amps 2 channels power amplifier Ultra Clean Opamp OPA1656 Buffer Audio sense: automatic on/off switching 3 Gain Settings by switch on rear Purifi Eigentakt technology RRP 1750 + delivery (plus waiting list) Super low power consumption The best performance to price ratio power amp available today. Outperforms units costing thousands more. Unbelievable measurements. Pure, clean power. Mint condition. Only 8 months old. Original box and packaging. Handled once (to place on shelf) Stunning sound quality. Tons of power. Incredible control. Universally glowing reviews. Exceptional measurements. Black/gunmetal case. The very highest build quality Ive ever seen. Sale due to switching to active monitors. See Audio Science Review here: https://www.audiosciencereview.com/forum/index.php?threads/boxem-arthur-4222-e1-amplifier-review.37930/ Google Purifi Eigentakt for various reviews of the Purifi board. Purifi Eigentakt technology For Arthur 4215/E2 we have chosen to implement the Purifi Eigentakt technology. Purifi is the first company to have managed to build a mathematically exact model for self-oscillating amplifiers. This innovation enables a complete optimization of the amplification circuits improving the performance by an order of magnitude over existing implementations. In more musical terms: - Highly resolved and stable stereo image across the whole spectrum, even during very complex and busy passages thanks to the negligible inter-modulation distortion (IMD). - A total lack of sonic signature, and an ability to reproduce any type of music without preference for genre or production style due to the extremely low THD at any frequency and any power level. - Difficult loudspeakers are handled with ease, including those that challenge most other amplifiers because of the load-invariant frequency response and negligible output impedance. - The smallest amount of audible artifacts when pushed into clipping or overload is guaranteed by an exceptionally clean clipping and clipping-recovery in both voltage and current domains. In Arthur 4215/E2, the amplification stage can deliver up to 210 W in 8 and 450 W in 2 Input buffer with boXem sauce Arthur 4215/E2 input buffer board was designed in-house. The challenge has been to fit in a relatively limited space the buffer circuits for two channels, the gain management switch, the audio sense circuit, the I2C bus communication with the amplifiers and finally the supplies for analog and digital circuits, all this while obtaining the performance at the same level as the amplification modules. OPA1656 op-amps were chosen because of their immaculate performance and the extremely low DC offset allowed by their architecture. Three levels gain setting A switch on the rear of the amplifier allows you to set three different levels of gain. Depending on the output capability of your source (pre-amplifier or DAC with volume control) the system gain structure can be optimized for two main targets. The first is to have the lowest noise, the second the smoothest volume setting as possible. High gain is optimized for sources outputting 2V, medium for 4V, low for gear able to provide 10 V. While the noise levels of modern audio gear has become so low that noise optimization for home audio is often purely academic, having a smooth volume control is something we find so enjoyable that it was our main motivation for integrating the gain control switch. Beautiful chassis, attractive finish The full aluminum custom chassis is not only nice looking, it dissipates the heat of the amplification module. No screws are visible from front, top and sides. The front plate is machined in an aluminum block and spray painted with different colors that can be chosen while ordering. The top and sides cover is a single piece finished with a special paint, with a mate, suede-like texture providing avery qualitative look and feel. Listen to the music, forget the electronics Plug your audio source (with volume control), your speakers, the mains cable, switch on the mains, and forget your amplifier. The automatic on/off function detects the presence of sound at the input and automatically powers on the amplifier. After 10 minutes without sound at the input, the amplifier sets itself in standby, allowing an ultra low power consumption when not in use. Fully protected A full set of fault diagnostics allows to protect the amplifier and your speakers against abnormalities. Designed and proudly built in Luxembourg Arthur 4215/E2 was designed and is assembled at Schifflange, Luxembourg, at the heart of Europe.

Boxem Purifi Amplifier. 2x Purifi Eigentakt Amps 2 channels power amplifier Ultra Clean Opamp OPA1656 Buffer Audio sense: automatic on/off switching 3 Gain Settings by switch on rear Purifi Eigentakt technology RRP 1750 + delivery (plus waiting list) Super low power consumption The best performance to price ratio power amp available today. Outperforms units costing thousands more. Unbelievable measurements. Pure, clean power. Mint condition. Only 8 months old. Original box and packaging. Handled once (to place on shelf) Stunning sound quality. Tons of power. Incredible control. Universally glowing reviews. Exceptional measurements. Black/gunmetal case. The very highest build quality Ive ever seen. Sale due to switching to active monitors. See Audio Science Review here: https://www.audiosciencereview.com/forum/index.php?threads/boxem-arthur-4222-e1-amplifier-review.37930/ Google Purifi Eigentakt for various reviews of the Purifi board. Purifi Eigentakt technology For Arthur 4215/E2 we have chosen to implement the Purifi Eigentakt technology. Purifi is the first company to have managed to build a mathematically exact model for self-oscillating amplifiers. This innovation enables a complete optimization of the amplification circuits improving the performance by an order of magnitude over existing implementations. In more musical terms: - Highly resolved and stable stereo image across the whole spectrum, even during very complex and busy passages thanks to the negligible inter-modulation distortion (IMD). - A total lack of sonic signature, and an ability to reproduce any type of music without preference for genre or production style due to the extremely low THD at any frequency and any power level. - Difficult loudspeakers are handled with ease, including those that challenge most other amplifiers because of the load-invariant frequency response and negligible output impedance. - The smallest amount of audible artifacts when pushed into clipping or overload is guaranteed by an exceptionally clean clipping and clipping-recovery in both voltage and current domains. In Arthur 4215/E2, the amplification stage can deliver up to 210 W in 8 and 450 W in 2 Input buffer with boXem sauce Arthur 4215/E2 input buffer board was designed in-house. The challenge has been to fit in a relatively limited space the buffer circuits for two channels, the gain management switch, the audio sense circuit, the I2C bus communication with the amplifiers and finally the supplies for analog and digital circuits, all this while obtaining the performance at the same level as the amplification modules. OPA1656 op-amps were chosen because of their immaculate performance and the extremely low DC offset allowed by their architecture. Three levels gain setting A switch on the rear of the amplifier allows you to set three different levels of gain. Depending on the output capability of your source (pre-amplifier or DAC with volume control) the system gain structure can be optimized for two main targets. The first is to have the lowest noise, the second the smoothest volume setting as possible. High gain is optimized for sources outputting 2V, medium for 4V, low for gear able to provide 10 V. While the noise levels of modern audio gear has become so low that noise optimization for home audio is often purely academic, having a smooth volume control is something we find so enjoyable that it was our main motivation for integrating the gain control switch. Beautiful chassis, attractive finish The full aluminum custom chassis is not only nice looking, it dissipates the heat of the amplification module. No screws are visible from front, top and sides. The front plate is machined in an aluminum block and spray painted with different colors that can be chosen while ordering. The top and sides cover is a single piece finished with a special paint, with a mate, suede-like texture providing avery qualitative look and feel. Listen to the music, forget the electronics Plug your audio source (with volume control), your speakers, the mains cable, switch on the mains, and forget your amplifier. The automatic on/off function detects the presence of sound at the input and automatically powers on the amplifier. After 10 minutes without sound at the input, the amplifier sets itself in standby, allowing an ultra low power consumption when not in use. Fully protected A full set of fault diagnostics allows to protect the amplifier and your speakers against abnormalities. Designed and proudly built in Luxembourg Arthur 4215/E2 was designed and is assembled at Schifflange, Luxembourg, at the heart of Europe.

Pair of Purifi Audio PTT6.5X04-NFA-01 6.5 Extended Stroke, Ultra Low Distortion Woofers. Retail price is currently $439 each. Great power handling and highly resolving! Purchased in January, 2022 and lightly used. See review article here: https://www.erinsaudiocorner.com/driveunits/purifi_ptt65w04/

Boxem Purifi Amplifier. 2x Purifi Eigentakt Amps 2 channels power amplifier Ultra Clean Opamp OPA1656 Buffer Audio sense: automatic on/off switching 3 Gain Settings by switch on rear Purifi Eigentakt technology RRP 1750 + delivery (plus waiting list) Super low power consumption The best performance to price ratio power amp available today. Outperforms units costing thousands more. Unbelievable measurements. Pure, clean power. Mint condition. Only 8 months old. Original box and packaging. Handled once (to place on shelf) Stunning sound quality. Tons of power. Incredible control. Universally glowing reviews. Exceptional measurements. Black/gunmetal case. The very highest build quality Ive ever seen. Sale due to switching to active monitors. See Audio Science Review here: https://www.audiosciencereview.com/forum/index.php?threads/boxem-arthur-4222-e1-amplifier-review.37930/ Google Purifi Eigentakt for various reviews of the Purifi board. Purifi Eigentakt technology For Arthur 4215/E2 we have chosen to implement the Purifi Eigentakt technology. Purifi is the first company to have managed to build a mathematically exact model for self-oscillating amplifiers. This innovation enables a complete optimization of the amplification circuits improving the performance by an order of magnitude over existing implementations. In more musical terms: - Highly resolved and stable stereo image across the whole spectrum, even during very complex and busy passages thanks to the negligible inter-modulation distortion (IMD). - A total lack of sonic signature, and an ability to reproduce any type of music without preference for genre or production style due to the extremely low THD at any frequency and any power level. - Difficult loudspeakers are handled with ease, including those that challenge most other amplifiers because of the load-invariant frequency response and negligible output impedance. - The smallest amount of audible artifacts when pushed into clipping or overload is guaranteed by an exceptionally clean clipping and clipping-recovery in both voltage and current domains. In Arthur 4215/E2, the amplification stage can deliver up to 210 W in 8 and 450 W in 2 Input buffer with boXem sauce Arthur 4215/E2 input buffer board was designed in-house. The challenge has been to fit in a relatively limited space the buffer circuits for two channels, the gain management switch, the audio sense circuit, the I2C bus communication with the amplifiers and finally the supplies for analog and digital circuits, all this while obtaining the performance at the same level as the amplification modules. OPA1656 op-amps were chosen because of their immaculate performance and the extremely low DC offset allowed by their architecture. Three levels gain setting A switch on the rear of the amplifier allows you to set three different levels of gain. Depending on the output capability of your source (pre-amplifier or DAC with volume control) the system gain structure can be optimized for two main targets. The first is to have the lowest noise, the second the smoothest volume setting as possible. High gain is optimized for sources outputting 2V, medium for 4V, low for gear able to provide 10 V. While the noise levels of modern audio gear has become so low that noise optimization for home audio is often purely academic, having a smooth volume control is something we find so enjoyable that it was our main motivation for integrating the gain control switch. Beautiful chassis, attractive finish The full aluminum custom chassis is not only nice looking, it dissipates the heat of the amplification module. No screws are visible from front, top and sides. The front plate is machined in an aluminum block and spray painted with different colors that can be chosen while ordering. The top and sides cover is a single piece finished with a special paint, with a mate, suede-like texture providing avery qualitative look and feel. Listen to the music, forget the electronics Plug your audio source (with volume control), your speakers, the mains cable, switch on the mains, and forget your amplifier. The automatic on/off function detects the presence of sound at the input and automatically powers on the amplifier. After 10 minutes without sound at the input, the amplifier sets itself in standby, allowing an ultra low power consumption when not in use. Fully protected A full set of fault diagnostics allows to protect the amplifier and your speakers against abnormalities. Designed and proudly built in Luxembourg Arthur 4215/E2 was designed and is assembled at Schifflange, Luxembourg, at the heart of Europe.

NAD M28 Purifi Power Amplifier Rare Chance. A rare chance to pick up this beautiful and clean amplifier - in fantastic condition and fully boxed with all accessories. I have been trialling several amps, processors and TVs so now I need to clear out. Any questions please feel free to ask. Please check my feedback - you will not be disappointed! Thanks for looking!Please note that the cost of postage is to ensure that the Amplifier is fully insured.Specifications are here:https://nadelectronics.com/product/m28-seven-channel-power-amplifier/

Boxem Purifi Amplifier. 2x Purifi Eigentakt Amps 2 channels power amplifier Ultra Clean Opamp OPA1656 Buffer Audio sense: automatic on/off switching 3 Gain Settings by switch on rear Purifi Eigentakt technology RRP 1750 + delivery (plus waiting list) Super low power consumption The best performance to price ratio power amp available today. Outperforms units costing thousands more. Unbelievable measurements. Pure, clean power. Mint condition. Only 8 months old. Original box and packaging. Handled once (to place on shelf) Stunning sound quality. Tons of power. Incredible control. Universally glowing reviews. Exceptional measurements. Black/gunmetal case. The very highest build quality Ive ever seen. Sale due to switching to active monitors. See Audio Science Review here: https://www.audiosciencereview.com/forum/index.php?threads/boxem-arthur-4222-e1-amplifier-review.37930/ Google Purifi Eigentakt for various reviews of the Purifi board. Purifi Eigentakt technology For Arthur 4215/E2 we have chosen to implement the Purifi Eigentakt technology. Purifi is the first company to have managed to build a mathematically exact model for self-oscillating amplifiers. This innovation enables a complete optimization of the amplification circuits improving the performance by an order of magnitude over existing implementations. In more musical terms: - Highly resolved and stable stereo image across the whole spectrum, even during very complex and busy passages thanks to the negligible inter-modulation distortion (IMD). - A total lack of sonic signature, and an ability to reproduce any type of music without preference for genre or production style due to the extremely low THD at any frequency and any power level. - Difficult loudspeakers are handled with ease, including those that challenge most other amplifiers because of the load-invariant frequency response and negligible output impedance. - The smallest amount of audible artifacts when pushed into clipping or overload is guaranteed by an exceptionally clean clipping and clipping-recovery in both voltage and current domains. In Arthur 4215/E2, the amplification stage can deliver up to 210 W in 8 and 450 W in 2 Input buffer with boXem sauce Arthur 4215/E2 input buffer board was designed in-house. The challenge has been to fit in a relatively limited space the buffer circuits for two channels, the gain management switch, the audio sense circuit, the I2C bus communication with the amplifiers and finally the supplies for analog and digital circuits, all this while obtaining the performance at the same level as the amplification modules. OPA1656 op-amps were chosen because of their immaculate performance and the extremely low DC offset allowed by their architecture. Three levels gain setting A switch on the rear of the amplifier allows you to set three different levels of gain. Depending on the output capability of your source (pre-amplifier or DAC with volume control) the system gain structure can be optimized for two main targets. The first is to have the lowest noise, the second the smoothest volume setting as possible. High gain is optimized for sources outputting 2V, medium for 4V, low for gear able to provide 10 V. While the noise levels of modern audio gear has become so low that noise optimization for home audio is often purely academic, having a smooth volume control is something we find so enjoyable that it was our main motivation for integrating the gain control switch. Beautiful chassis, attractive finish The full aluminum custom chassis is not only nice looking, it dissipates the heat of the amplification module. No screws are visible from front, top and sides. The front plate is machined in an aluminum block and spray painted with different colors that can be chosen while ordering. The top and sides cover is a single piece finished with a special paint, with a mate, suede-like texture providing avery qualitative look and feel. Listen to the music, forget the electronics Plug your audio source (with volume control), your speakers, the mains cable, switch on the mains, and forget your amplifier. The automatic on/off function detects the presence of sound at the input and automatically powers on the amplifier. After 10 minutes without sound at the input, the amplifier sets itself in standby, allowing an ultra low power consumption when not in use. Fully protected A full set of fault diagnostics allows to protect the amplifier and your speakers against abnormalities. Designed and proudly built in Luxembourg Arthur 4215/E2 was designed and is assembled at Schifflange, Luxembourg, at the heart of Europe.