Reviews

DAC2, HPA4, AHB2 - "The Benchmark Hi-Fi Stack ..."

"Find a Better Hi-Fi Stack! Double-Dog-Dare you!"

- Ron, NewRecordDay.com

AHB2 - "Reveals All"

Jay discusses the sonic tradeoffs between transparency and the sound of tube-induced distortion. He describes how his tube amps may make poor recordings sound enjoyable while the AHB2 reveals all.

HPA4 - "Speeding Up My Work, Helping Me Make Better Decisions"

Award-Winning Composer, Ken Jacobsen, Talks About His Benchmark HPA4

"I don't think it is sterile sounding at all ... it is very neutral."

"In the studio, neutral, flat and detailed are on the top of my list."

"The HPA4 is speeding up my work, helping me make better decisions."

 - Ken Jacobsen, Ken Jacobsen Music

HPA4, LA4 - "Pro Audio Products in the Home"

HPA4 vs. LA4

"The HPA4 and LA4 are preamplifiers and largely identical. The HPA4 also has a built-in headphone amplifier."

"The Benchmark HPA4 and LA4 preamps deliver a very high quality neutral and transparent signal."

"Developed from a professional focus on sound reproduction, they bring the essence of the recording closer to the listener."

"The professional market often offers products that may also be of interest to the 'ordinary' consumer."

"In Japan in particular, home systems often consist of a mix of consumer equipment and (vintage) professional items."

"Benchmark was founded in 1983 and started building professional audio equipment."

"The goal, from the outset, is to build sound-transparent equipment of the highest quality. The employees are musicians, audiophiles and audio technicians. So sound quality is top notch."

- Ruud Jonker, FWD Magazine, fwd.nl

LA4 - "Joining My Stable of Reference Components"

"Before I dig into the sound of the LA4 it is important to know that it employs a wide bandwidth design. The LA4’s bandwidth is specified at 0.2 Hz to 500 kHz."

"Most of the wide bandwidth designs I have heard exhibit ... a purity in tone with superb timing and speed ... the LA4 proved to be no exception."

"The Benchmark LA4 yielded a change that was quickly apparent in several areas."

"Notably were; bass, upper midrange, treble, low-level listening, and the ability to distinguish the colorations of other components that were contributing to my overall sound."

"Acoustic guitar, piano, and harmonica among many other instruments are presented with speed, clarity, and coherency that made them sound more “present” in the room and less like a recording."

"The Benchmark LA4 is simply the most transparent, least colored, and most revealing component I have had in my system to date. I look forward to it joining my stable of reference components."

"Highly recommended."

- Ken Redmond, The Audio Beatnik

AHB2 - "I Purchased Two Units With My Hard-Earned Money"

"The highest compliment I can give to AHB2 is that I purchased not one, but two units with my hard-earned money. These weren’t loaner units and this wasn’t a sponsored review and you can draw your own conclusions."

"The AHB2 might look small and lightweight, but thanks to its clever engineering and power supply implementation, this little fellow could still deliver 190 Watts in 4 Ohms and 100 Watts in 8 Ohms, while maintaining an undetectable noise floor and distortion."

"For the craziest folks out there, you can even bridge two pieces together for ~580 Watts in 4 Ohms and 380W in 8 ohms."

- Sandu Vitalie, SoundNews.net

LA4 - "Best Volume Control"

"By far, without question this is the best volume control I have ever encountered."

"I must single out for special mention the volume control. While the whole unit is completely relay controlled, with a total of forty “precision relays switching high-precision metal-film resistors,” each channel has its own gain control with 256 steps in 0.5dB increments."

"Suffice it to say that, as with every Benchmark product I’ve used or reviewed, everything works smoothly, precisely, flawlessly."

- Paul Seydor, The Absolute Sound

"The Benchmark AHB2 is a power amp meant to power speakers. There seems to be an interest in it for hard to power headphone enthusiasts on the forum even though Benchmark makes the HPA4 which is a headphone amp. That said, folks trying to drive the Hifiman HE-6 and Susvara gravitates towards this piece of gear."

"Finally, I pulled the trigger on the AHB2 and couldn’t be happier."

 "None of these have been provided to me. I bought everything pictured."

HPA4 - "Best High-End Stereo Preamplifier"

"The Benchmark Media Systems HPA4 preamplifier is an exceptionally transparent and well-designed audio device."

"I found it to be an extremely neutral reference point that allowed me to hear more of what a connected speaker or headphone was actually doing and, in turn, how much my existing electronics were adding to the sound that I was hearing in my reviews."

- Carlo Lo Raso, Co-Editor, Secrets of Home Theater and High Fidelity

AHB2 - As a Headphone Amplifier - "My Daily Driver V2.0"

Hifiman Susvara Headphones - Driven by Benchmark AHB2

"Holy mother of Thor, this is dynamics, speed, transient response, resolution and transparency incarnate into a single metal box. There isn’t a clearer, a more resolving or a more transparent sounding amplifier out there, this is a wire with gain amplifier that doesn’t add anything into the mix."

"You can’t get a more impactful, a faster or cleaner sounding amplifier.

- Sandu Vitalie, SoundNews.net

AHB2 Headphone Adapter Cable

HPA4 - Ear 5-Star Rating

"Benchmark’s HPA4 is the first item of audio kit I have encountered that peels apart the ying and the yang of audio to expose the fault line between those of us for whom measurements are all that matters… and those of us that approach audio from a more emotional, less scientific direction. But in another sense it might also bridge the divide."

HPA4 Driving the Audeze LCD-5

"It had been the arrival of Audeze’s latest flagship planar headphone the LCD-5 that had prompted me to ask if I might borrow an HPA4."

"With the LCD-5 being a statement 14 Ohm/90db design, I felt I owed it to Audeze and myself to try driving the headphone with an amplifier whose specs suggested that it could easily cope with the requirement for current."

"The LCD-5 and HPA4 made an impressive partnership."

"On more energetic material, such as Marcus Miller’s M2 album from 2001, and the aptly named track Power, the LCD-5 showed that the HPA4 couples deep reserves of low-end grunt with a good level of dynamic expression. At loud but not silly volumes, the boom and snap of Miller’s slap bass technique had timing and tonal qualities that to my ears – alas, I do not have Miller’s talent but I do play bass – sounded uncommonly real through the LCD-5 headphone."

"I’d encourage anyone in the market for a high-end headphone amplifier to audition an HPA4."

"It is a device that achieves stellar measurements, yet sounds excellent too; evidence that the science-based approach can deliver high musicality."

"The HPA4 can drive pretty much anything, its resolution is truly remarkable, and you will likely hear your music with an acuity as never before."

-Kevin Fiske, the-ear.net

AHB2 - Mono Mode - "The Playback in Mono Mode is Off the Charts"

"The HPA4 and AHB2 have been a fixture in our reference set for several years now."

"In stereo mode we get a nice 100 watts (8 ohms class A/B) but in mono that goes to an impressive 380 watts!"

"We set the small switch on the back of the AHB2s to mono and connect each speaker to an AHB2."

"The playback in mono is 'off the charts' ... there's no going back really. You have been warned!"

"Benchmark Media Systems Inc from Syracuse, New-York is an American company and has been one of the top pro-audio manufacturers for thirty years. In recent years they have also ventured into the consumer market with considerable success."

"In collaboration with THX came the AHB2 power amplifier and not much later they developed a suitable headphone amplifier and preamplifier, the HPA4 and LA4 respectively."

- Geoffrey Vanhouwaert, Alpha-Audio

AHB2 - "A-Rated Power Amplifier"

The "A" rating is the highest honor awarded in the Power Amplifier category.

"Benchmark's AHB2 makes use of THX Corporation's Achromatic Audio Amplifier (AAA) technology, in which a low-power feed-forward amplifier drives a low-bias class-AB output section."

"Much more apparent low-level detail in already-familiar recordings" - Kalman Rubinson

"A tonal balance that sounded more 'right' than any of [the other amps on hand]." - Kalman Rubinson

"An extraordinary amplifier." - John Atkinson

HPA4 - "Class A Recommended" Headphone Amplifier

"With the hard-to-drive HiFiMan Susvara headphones, the HPA4 showed each instrument in dramatic bas-relief. It accomplished this by presenting cleaner, better-articulated bass and manufacturing a sharper midrange focus than I had experienced previously with either my solid state reference, the Pass Labs HPA-1, or the tubed Linear Tube Audio Z10e.”

- Herb Reichert

"The LA4 preamplifier was the widest-bandwidth, widest-dynamic-range, lowest-noise, lowest-distortion preamplifier I had encountered at that time ... to those virtues, the HPA4 adds equally superb balanced and single-ended headphone outputs."

- John Atkinson

LA4 - "Class A Recommended Preamplifier"

"Class A" is the highest level awarded in the "Two Channel Preamplifier" category.

"Like other Benchmark equipment he has tested, the affordable LA4 challenged the resolution of JA's test instruments, with "superb" channel separation, "extremely low noise, and virtually no power-supply-related spuriae.""

"Benchmark's LA4 is the widest-bandwidth, widest-dynamic-range, lowest-noise, lowest-distortion preamplifier I have encountered." - John Atkinson

"The LA4 is probably the most transparent and revealing audio component I've ever used. It does not seem to leave any fingerprints on the sound." - Kalman Rubinson

DAC3 HGC - "A+ Rated Digital Processor"

"A+" is the highest level awarded in the "Digital Processor" category.

"The DAC3 was all about depths, in several respects . . . I heard deeper into the music." - Jim Austin

"Benchmark's DAC3 HGC offers state-of-the-art measured performance. All I can say is 'Wow!'" - John Atkinson

AHB2 - "Thumbs Firmly Aloft"

Stereonet Applause Award - Benchmark AHB2

"I can't think of many amps with dual hi-fi and pro functionality. Maybe Bryston and the odd ATC, but there aren't a lot. However, to this shortlist, we can add Benchmark."

"Two things strike you upon first seeing it – it's surprisingly compact, and it also has the sort of features that make it more at home in a studio than a listening room lounge space."

"You can bridge the AHB2 to make it a monoblock, or bi-wire it to a single speaker; there are only balanced connections incoming, as well as a choice of gain to match the speaker. You get normal speaker binding posts plus a pair of Neutrik's SpeakOn connectors on the output side."

"Thumbs firmly aloft then for this compact, versatile, thoughtfully designed, well-built stereo power amplifier."

- Rafael Todes, Stereonet.com

DAC3 B, HPA4, AHB2 - "Purchased Them for My Reference System - Nuff Said!"

"The Benchmark 'stack' ... saw use with a wide variety of loudspeakers and other electronic equipment."

"Having the Benchmark stack here for an extended period also made me re-evaluate a few things about how and what I use to review equipment."

"I dare say that they produced as clean and noise-free a stereo playback chain as I have ever come across."

"Benchmark Media Systems is a well-regarded brand that is known for its high-quality DACs and ADCs that also find their way into professional studios."

AHB2 Power Amplifier

"In 2014 they introduced the AHB2 power amplifier, using patented THX AAA amplifier technology, that brought previously unheard of low levels of distortion, and high SNR capability."

LA4 and HPA4

"Last year Benchmark released the LA4 preamplifier and the HPA4 headphone amplifier. Both components use an ultra-precision relay-based volume control and feature vanishingly low levels of distortion."

DAC3 B

"The DAC3 B is an alternate version of the DAC3 DX that ... simply does away with the included volume control and headphone jacks which makes it ideal to use with the HPA4 or LA4."

"The Benchmark DAC3 B ... is a finely executed example of a modern ESS-based digital to analog converter."

The Benchmark 'Stack'

"The Benchmark Media Systems HPA4 preamplifier, AHB2 power amplifier, and DAC3 B are, individually, exceptionally transparent and well-designed audio devices."

"When used as a system the resulting synergy was even more revealing."

"I liked them so much that I purchased them for my reference system. Nuff said!"

- Carlo Lo Raso, Secrets of Home Theater and High Fidelity

HPA4 - "Satisfied my Engineering Mind and my Audiophile Lust"

"Spending a month with the HPA4 forced this old triode-tube lover to first acknowledge, then accept, and finally enjoy a new type of engagement, one that satisfied my engineering mind and my audiophile lust to look and listen into the hidden nooks and distant corners of every recording. Thank you, Benchmark."

- Herb Reichert, Stereophile

The HPA4 is not just a "Reference Stereo Headphone Amplifier"; it is also a "Reference Line Amplifier" with "Relay Gain and Input Control."

Relay-Controlled Gain

"The fully balanced relay-controlled gain stage applies up to 15 dB of gain or up to 127.5 dB of attenuation for a total range of 142.5 dB. There are 286 volume control steps in precise 0.5 dB increments."

Line Amplifier

"During my first day of HPA4 listening, I noticed that every digital and analog recording ... sounded cleaner, better sorted, and more macrodynamic."

"The HPA4's sharp-focus specificity is something I associate with recording studio sound but almost never encounter in home systems."

Headphone Amplifier

"The THX-888 headphone amplifier board "is a unity gain (current) amplifier with feedforward error correction." Feedforward error correction is also used in the AHB2 power amplifier."

No Difficulty Driving the Susvara Headphones

"With most headphone amplifiers, the tires go flat trying to drive HiFiMan's Susvara open-backed planar-magnetic circumaural headphones.

"The HPA4 exhibited no difficulty driving low-sensitivity, low-impedance planar magnetics."

HPA4 - Bench Test

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. This report therefore focuses on the HPA4's behavior as a headphone amplifier."

"The headphone amplifier's frequency response was flat in the audio band and down by just 1 dB at 200 kHz. With the very low output impedance, the response into 300 ohms was identical to that into the high 100k ohms load, and there wasn't any audio band rolloff with impedances as low as 10 ohms."

"Both the response and the superb channel matching were identical at lower settings of the control and from the unbalanced headphone output."

"From balanced inputs to balanced headphone output, the Benchmark had extremely low noise, with the power supply–related spuriae in its output close to –130dB, even with the volume control set to +15dB. With the volume control set to unity gain, the noise floor was 12dB lower!"

"The THD+N percentage was extremely low throughout the audio band into both 100k ohms and 300 ohms."

"I concluded my report on Benchmark's LA4 preamplifier by saying it was the widest-bandwidth, widest-dynamic-range, lowest-noise, lowest-distortion preamplifier I had encountered at that time. To those virtues, the HPA4 adds equally superb headphone outputs."

- John Atkinson, Stereophile