AHB2 Review - Paul Rigby, The Audiophile Man
AHB2 - "The Perfect Heart to any Hi-Fi"
"Starting with Dakota Staton’s album ‘Round Midnight from the original Capitol release, issued in 1960, I connected the Benchmark to my Quad 57 electrostatics."
"Staton’s vocal delivery was calm, even and smooth without any edginess to her delivery and certainly without any brightness or blooming during crescendos. Her even-handed vocal delivery was very pleasant indeed."
"As for the instruments backing Staton, I was impressed by the tonal accuracy of the introductory strings and the clarinet. Both, backed by the similarly impressive low noise nature of the soundstage, had room to express themselves that enhanced the richness of their performance."
"Everything was in order and everything was in its place. Part of the reason for this was the low noise so, right from the off, the music was much more focused than many other components."
"Bass was never one dimensional but had a layered personality of its own."
- Paul Rigby, The Audiophile Man - audiophileman.com
Caution:
In his review, Paul Rigby mentions driving Quad ESL-57 electrostatic speakers using the AHB2 in bridged-mono mode. Potentially, this mode will provide too much output to the ESL-57 speaker and this may cause damage. The ESL-57s are rated for a maximum input voltage of 33V. The AHB2 can deliver 40V in stereo mode and 80V in mono mode. Mono mode can severely overdrive the ESL-57 speakers and may cause permanent damage to the electrostatic panels. The AHB2 should be used in stereo mode when driving ESL-57 speakers. Apparently the AHB2 gain switch was configured for a lower gain than Paul's other amplifier. This led him to believe that the AHB2 needed to run in bridged-mono mode when driving his ESL-57 speakers. The correct action would have been to turn up the preamplifier and/or adjust the gain switch on the back of the AHB2.
- Benchmark
Also in Reviews
AHB2 Review - Constantine Soo, Dagogo
"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
DAC3 Review - Jerry Del Colliano
"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
DAC3 & AHB2 - System Review, Trevor Butler, The-Ear.net
"I began with the DAC3 HGC and AHB2 powering the glorious Morel Avyra 633 three-way floorstanders."
"This pairing created a full-bodied sound which brought the recording to life."
"Notable from the off was the bass from the DAC3 HGC and AHB2."
"Wow! It was deep, tight and conveyed a real feeling that the electronics were in charge of the transducers."
"Involuntary foot-tapping confirmed the timing ability and the overall presentation was spot-on, the Benchmark electronics created a fluent sound across a vivid soundstage; performers evident both tonally and spatially in an easy-to-believe presentation that brought the performance close."
"The Benchmark’s ability to retrieve deep-down detail and display it so well across the soundstage, with accurate positioning and convincing layering, made for a glorious re-creation of the recordings."
"To my mind the AHB2 is an amplifier with no obvious characteristics of its own: the level of transparency is sublime."
"Above all, the improved transient response performance stood out in a presentation that was not only lively but incredibly fast and revealing. The attack and decay displayed was awesome and not something I expect at this price point."
"The Benchmark DAC3 HGC and AHB2 are cracking products, sonically superior to a lot that’s available and well priced."
"They are superbly designed and built to an extremely high standard."
- Trevor Butler, the-ear.net