The 16-bit Compact Disc therefore has a noise floor at ≩6dB and change, hence cannot resolve information lower than ≩6dB. (An interview Scott Wilkinson conducted with Fincham about this technology can be seen at Scott's website, Home Theater Geeks.") In a presentation at the 2013 Rocky Mountain Audio Fest, Fincham and Benchmark's John Siau explained how the AHB2 used the THX technology to produce a 100W amplifier with sufficient dynamic range ie, very low noise and distortion compared with the maximum signal voltageto preserve the theoretical dynamic range of high-resolution recordings.Įach 1-bit increase in bit depth is equivalent to lowering the noise floor by 6.02dB. Laurie Fincham of THX had explained to me that the innovative technology, developed by a team including Fincham, Andrew Mason, and Owen Jones (twin brother of noted speaker designer Andrew Jones), offered both extremely efficient conversion of AC power from the wall into DC power to feed to the amplifier circuit and extraordinarily low distortion. I had first learned about the power-supply and amplifier topology used in the AHB2 at the 2012 Consumer Electronics Show. The percentage of THD+noise at this power level was an extremely low 0.0005% with the AHB2 fully warm. Following that period, the top panel was warm, at 106.7☏ (41.5☌), though the heatsinks were hotter, of course, at 117.3☏ (47.4☌). As the AHB2 is specified as having a maximum power output of 100Wpc into 8 ohms, I preconditioned it before measuring it by running it at one-third that power into 8 ohms for an hour. 14440108-0111-0), using my Audio Precision SYS2722 system (see the January 2008 " As We See It"), and the amplifier's binding posts rather than its Neutrik terminals.
BENCHMARK AHB2 SMPS POWER SUPPLY FULL
I performed a full set of measurements on two samples of the Benchmark AHB2 (serial nos.
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