Audio Research Ref 160M MkII Mono Power Amplifier - PAIR MSRP: $45,000Color: Black These amplifiers are in excellent condition and function flawlessly. They are consecutive serial number amplifiers and they include their original packaging, user manual, tubes (1015 hours), 20a power cords, bias adjustment tool, and cover removal tool. These are the current version (Mk II) of the Ref 160M mono blocks and come broken in with 1014 and 1015 hours on the tubes. There are a couple very minor marks on the rear corner of the tube covers as shown in the photos. These amplifiers are available with freight shipping available or for local pickup in Columbus, OH. Feel free to message me your shipping zip code for a freight quote. Do not miss the chance to own these amazing amplifiers at an incredible price. After two years in development, the new Reference 160M MkII Monoblock Power Amplifier is built like no other, looks like no other, and sounds like no other amplifier that you have ever heard - but it is unmistakably Audio Research. It features a refined audio topology with fewer and better components in the signal-path, switchable Ultralinear/Triode operation, proprietary auto-bias, output tube monitoring and protection, an advanced power meter, and much more. This array of features has never been offered before in an Audio Research amplifier. POWER OUTPUT140 watts continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 1% at 140 watts, below 0.04% at 1 watt. (Note that actual power output is dependent upon both line voltage and “condition” i.e.: if power line has high distortion, maximum power will be affected adversely, although from a listening standpoint this is not critical)POWER BANDWIDTH(-3dB points) 5Hz to 70kHzFREQUENCY RESPONSE(-3dB points at 1 watt) 0.5Hz to 110 kHzINPUT SENSITIVITY2.4V RMS Balanced for rated output. (25.5 dB gain into 8 ohms)INPUT IMPEDANCE300K ohms Balanced, 100K ohms Single EndedOUTPUT TAPS16 ohms, 8 ohms, 4 ohmsOUTPUT REGULATIONApproximately 0.6dB 16 ohm load to open circuitOVERALL NEGATIVE FEEDBACK14dBDAMPING FACTORApproximately 14DISTORTION-SLEW RATE13 volts/microsecondRISE TIME2.0 microsecondsHUM & NOISE-POWER SUPPLY ENERGY STORAGE-POWER REQUIREMENTS105-130VAC 60Hz (210-250VAC 50Hz) 400 watts at rated output, 700 watts maximum, 260 watts at “idle”, 1 watt of.TUBE COMPLEMENT(2 matched pair) KT150 power output, (2) 6H30 gain stageOTHEROutput polarity: Non-inverting. Balanced input pin 2+ (IEC-268).DIMENSIONSWidth 17 ¼ (43.8 cm). Height 10 (25.4 cm). Depth 18½ (47 cm). Handles extended 19 ¼ (48.9 cm).WEIGHT56 lbs. (25.5 kg) Net; 73 lbs. (33.2 kg) Shipping.Check out my other listings.Feel free to ask any questions.NOTE: These amplifiers are being offered with freight shipping available or for local pickup in Columbus, OH. They are being offered as is with no returns.