![]() ![]() "The HPA4's output impedance from both headphone outputs was extremely low, at 0.6 ohm at 20Hz and 1kHz, rising slightly to 0.83 ohm at 20kHz. "The HPA4 preamplifier preserved absolute polarity (ie, was noninverting) with both balanced and unbalanced inputs and outputs." Reducing the control to "0.0" resulted in a gain of 0dB, ie, the output voltage was the same as the input voltage." ![]() "The gain for the balanced inputs to both the headphone outputs with the volume control set to "+15" was exactly 15dB. This report therefore focuses on the HPA4's behavior as a headphone amplifier." As a line preamplifier, the HPA4 performed almost identically to Benchmark's superb-measuring LA4, which Kal Rubinson reviewed in January 2020, so I will refer you to that review. "I measured the Benchmark HPA4's performance with my Audio Precision SYS2722 system (see the January 2008 " As We See It"), repeating some tests with the magazine's sample of Audio Precision's current top-line APx555.
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