These are a pair of fully built Hypex NC400 monoblocks. Unbelievable power with fantastic sound. Damping factor is fantastic, control throughout the frequency range is impeccable. See the review for these in audiosciencereview.com. These are superior amplifiers for difficult loads. I used to own tube amps, these class D amps sound just as good in my opinion. Im retiring and getting rid of a bunch of stuff, living lean. Any questions PM me.

Pair of Hypex NC400 MonoblocksPurchased from hypex and assembled in 2019. Light use in a second system in my home.

NAD Masters M22 v2 Class D Stereo Amplifier XLR & RCA inputs.The Masters Series M22 is based on a version of Hypex Electronics model NC400 NCore amplifier. Purchased late 2020, in original NAD double box for safe delivery. Check out the EXCELLENT review on Stereophile!! AUDIO SPECIFICATIONSContinuous output power into 8 ohms and 300 W (20 Hz-20 kHz at 0.1% THD, both channels driven)4 ohms (Stereo mode) Continuous output power into 8 ohms (Bridge mode) 900 W (20 Hz – 20 kHz at 0.1% THD) THD+N (20 Hz – 20 kHz, CCIF IMD, SMPTE IMD, DIM 100) 100 dB (A-weighted, ref. 1 W in 8 ohms>120 dB (A-weighted, ref. 300W in 8 ohms) Clipping power (Stereo mode, at 1 kHz >300 W8 ohms 0.1 % THD) Clipping power (Bridge mode, at 1 kHz >950 W8 ohms 0.1 % THD) IHF dynamic power (Stereo mode, at 1 kHz 1 % THD) 8 ohms: 400 W4 ohms: 700 W2 ohms: 1000 W Damping factor >800 (ref. 8 ohms) Frequency response ±0.1 dB (20 Hz - 20 kHz) Input sensitivity (for 300W in 8 ohms) 1.73 V Gain level Low: 19 dBMedium: 24 dBHigh: 29 dB Minimum input level for Auto Trigger 5 mV at 1 kHz Standby power <0.5 W DIMENSION AND WEIGHTGross dimensions (W x H x D) 435 x 103 x 379 mm17 1/8 x 4 1/16 x 14 15/16 inchesNet Weight 8.9 kg (19.6 lbs) Shipping Weight 15 kg (33.1 lbs)

Hypex Nc400 Stereo Amp DIY. I built these as Monoblocks but then moved them into a stereo case. Dual power supplies and modules. Speaker terminal polarity is wired correctly even though they are reversed on the case. Red is positive for both channels.