The HPA4 definitely measures better than the SPL unit, though both perform at a level where the differences should be inaudible (see “Failures of Logic”), so that’ll be a particularly interesting back-to-back test for me. So, I’ll go about rounding one up and doing a proper review of the thing, as well as a side-by-side comparison with the Phonitor X (obviously using both in pre-amp configuration as well as headphone-amp mode). That changed with the SR1a … so it may just be that something more resolving was needed to tell other differences apart. Which is one reason why I bought the Phonitor X. I didn’t run into that with the Phonitor X. When I first heard it, while I thought it was genuinely excellent, when compared to the direct output of the Chord DAVE (same internal connections feed the RCA and XLR outputs on its rear) it seemed a little on the lean side. I should probably get another copy of this amplifier in to do a direct comparison with the Phonitor X, now that I have the SR1a. To make this all happen, the HPA4 includes a total of 64 precision relays. The HPA4 includes 4 independent 256-step attenuators: two for the L&R headphone outputs, and two for the L&R line outputs. No other relay gain control offers this level of precision and performance. Relay closures are precisely timed to deliver silky-smooth volume changes. The gain control has 256 steps in 0.5 dB increments. The line amplifier incorporates the finest gold-contact relays available. The THX-888 amplifier is driven by a Benchmark line amplifier that features relay gain control, relay input selection, and relay muting. The HPA4 delivers power, audio fidelity, speed and accuracy over an utterly silent background. Hear the music without any contamination from electronic noise or distortion. THX AAA allows the amplifier to reach its maximum output power and sound pressure level (SPL) without producing the distortion that normally accompanies increased output levels in traditional amplifiers.įeaturing the flagship THX-888 amplifier design, the revolutionary HPA4 headphone amplifier incorporates the same THX AAAtechnology that Benchmark uses in the AHB2 power amplifier. It accomplishes this using a patented feed-forward topology to null conventional distortion and noise mechanisms, resulting in the world’s most linear amplifier. THX AAA™ reduces harmonic, intermodulation, and crossover distortion by 20 to 40 dB to guarantee a realistic and fatigue-free listening experience. have partnered to introduce the Benchmark HPA4 headphone/line amplifier featuring THX Achromatic Audio Amplifier (AAA™) technology.
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