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by Benchmark Media Systems June 12, 2019
"In the past decade, Benchmark consumer products, especially its digital-to-analogue converters, have achieved acclaim for ultra-low distortion and clean sound."
"While the company is very strongly engineering-oriented, it maintains that listening tests are critical to product development."
"The HPA4 is Benchmark’s latest headphone amplifier. This amp is unusual in that it features a THX-888 Achromatic Audio Amplifier, which is claimed to reduce distortion by 20–40 db through a patented feed-forward design resulting in the world’s most linear amplifier."
"In addition to the THX amp circuitry, Benchmark has gone slightly nuts (in a good way) with the volume control, offering 256 levels in 0.5 db steps via an array of relays."
"Benchmark doesn’t stop there. The HPA4 is a high voltage, high current design to allow low sensitivity headphones to work well."
"In addition, the damping factor is high (near zero ohms output impedance), with the aim of sounding the same with low, medium, and high impedance headphones."
"That’s all great, but many fancy-sounding circuits sound like dirt. Happily, that isn’t the case with this one."
"The HPA4 is exceptionally good at presenting a layered, dynamic yet relaxed sound."
"You can hear these rich results on, for example, Eliza Gilkyson’s Hard Times In Babylon [Red House], where the instruments not only are clearly differentiated but also sound fully rendered, as live instruments do."
"You also can hear the overtones of each instrument as they decay, which makes them sound more real."
"This adds up to a super-revealing amp that isn’t going to correct the mistakes of the rest of your system. I thought top-flight headphones sounded great as a result, but that doesn’t necessarily make it the amp for you. I, however, wish the review sample didn’t have to go back."
- Tom Martin, HI-FI+
Read the entire review at HiFiPlus.com →
After this review, Hi-Fi+ selected the HPA4 as one of the "Top 100 Products of the Past 20 years" (1999 to 2019).
by Benchmark Media Systems September 23, 2024
"For years, the audio world acknowledged one main contender (at least at sub-five-figure pricing) for the quietest, cleanest, most neutral power amplifier around. That was the Benchmark AHB2, whose specifications are still, for all practical purposes, unsurpassed, even by today’s excellent Class-D amps."
"10 years after its release, the Benchmark Media Systems AHB2 stereo power amp is still a standard-bearer in clean, neutral sound in the audiophile world."
"I greatly enjoyed having a pair of AHB2s in my system – their purity, neutrality, and seemingly unlimited power provided a clear window on the music and a lot of joy."
"I especially appreciated the AHB2’s smooth, well-integrated treble, free of splashiness or grain, and its natural reproduction of the human voice."
- Mike Prager, Future Audiophile
by Benchmark Media Systems April 02, 2024
"The AHB2 bridgeable stereo amplifier ... was the topic of a recent discussion between American electrostatic panel speaker manufacturer Sound Lab’s president, Dr. Roger West, and me."
"In our discussion, he related his highly positive experience in driving even his largest, $55k Majestic 945 panels with the $7,000 pair of Benchmark Media AHB2 monoblocks, along with the $3,050 LA4 Preamplifier and factory XLR cables."
"Dr. West described the AHB2 as a class AB design using “feed-forward distortion reduction [thus removing] any possibility of pushing the margin of safety of a standard feedback loop, used in most amplifiers, into an unstable oscillatory mode.”"
"He further shared with me that “this is of most concern on powerful musical transients. The distortion of the amplifier in the balanced mode is astonishingly low even at just below the clipping level of 380 watts.”"
"The prospect of the AHB2’s specified distortion level of 0.00015% or lower when at full volume is comical at first glance, but upon actual audition the impact of the achievement is very audible from medium-high listening levels and upward."
"It was unlike any other sub-$20,000 amplifier I have auditioned."
"My audition of the Benchmark Media AHB2 amplifiers underscores the reason Dr. West is so taken by it, and confirms the design is best described as a watershed moment in the high-end audio industry."
- Constantine Soo, Dagogo
by Benchmark Media Systems April 02, 2024
"Benchmark is a stalwart brand in pro audio, but has carved out a very respectable niche in the audiophile world with their diminutive but powerful components."
"The audiophile world sometimes looks to the professional audio world for enlightenment, especially on the digital side of things, and Benchmark Media is one of the companies that we put high on a pedestal."
"They are hardcore digital engineers freezing their asses off in upstate New York as they come up with some pretty innovative ways to get your varied digital sources sounding as much like the master tape as possible. Thank you for your service, gentlemen."
"If you really want to hear what your music sounds like in today’s streaming-driven world, this might just be the DAC that you need to test out."
- Jerry Del Colliano, Future Audiophile