Solid reliable amplifier from Audio Research, very musical and detailed. Finished in anodized black with convenient handles which makes it easy to move around. Very clean and free from any significant signs of use. Features 160 Watts per Channel into 8 ohms, 300 Watts per Channel into 4 Ohms and in Bridged mode; 600 Watts Mono into 8 Ohms and 900 watts Mono into 4 Ohms. On the back you'll find everything you need including RCA and balanced XLR inputs, beefy solid brass speaker posts, and we're also including a captive large gauge power cord. We also have a second unit currently listed if you'd like to bridge the two into mono for a spectacular 600W per side. Our Testing Process for Amplifiers (Solid State) at SkyFi:We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage. We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage Kef speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice. Please click here for detailed specifics regarding our specialized packing process that separates us from the rest. Item Included Original Box No Manual No Remote N/A Cables Yes - Power Physical Condition 8 Working Condition 10
