John Atkinson, too, is a hard man, at least when it comes to audio gear. When, in January 2014, he reviewed the Pass Laboratories XA60.5…

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Description: Class-A, solid-state, monoblock power amplifier. Inputs: 1 unbalanced (RCA), 1 balanced (XLR). Outputs: 2 pairs, can accommodate spades or bananas. Power output: 60W into 8 ohms (17.8dBW), 120W into 4 ohms (17.8dBW). Frequency range: 1.5Hz–100kHz. Voltage gain: 26dB. Input sensitivity: 2.83V RMS output for 150mV input. Input impedance: 100k ohms balanced, 50k ohms unbalanced. Output impedance: not specified. Signal/noise: >85dB, ref. level 2.83V RMS. Power consumption: 375W. Trigger input, 12V DC (RCA).
Dimensions: 19" (480mm) W by 7.5" (…
Analog Sources: Thorens TD 124 turntable (reconditioned by Schopper AG); Ortofon RMG-212 (rebuilt), Thomas Schick 12" tonearms; Ortofon 90th Anniversary SPU cartridge.
Digital Sources: MacBook Pro computer (early 2015); Roon Optimized Core Kit running on Intel NUC computer with SSD drive; Benchmark DAC 1, Meridian Explorer2 USB, Mytek HiFi Brooklyn, PS Audio DirectStream DACs.
Preamplification: Auditorium 23 Standard step-up transformer, EAR 834P phono stage.
Power Amplifiers: Benchmark AHB-2 bridged for use as monoblocks), PS Audio BHK…
Before performing any measurements, I ran one Pass Labs XA60.8 (serial no. 28984) for an hour at one-third its specified maximum power of 60W into 8 ohms—thermally, the worst case for an amplifier with a class-B or -AB output stage. By the end of the hour, the top panel was warm, at 96.4°F (35.8°C), and the side-mounted heatsinks were a little hotter, at 109.1°F (42.8°C). (Temperatures were measured with a Mastercool infrared thermometer.) The XA60.8 ran a little cooler than the XA60.5 I reviewed in January 2014, probably due to its larger heatsinks.
I…
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