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System Review - DAC3, HPA4, AHB2 - Geoffrey Vanhouwaert, Alpha-Audio

System Review - DAC3, HPA4, AHB2 - Geoffrey Vanhouwaert, Alpha-Audio

by Benchmark Media Systems April 08, 2020

"There are many things that come into play when putting together a hi-fi system, one of which is synergy."

"After the arrival of the Benchmark Media Systems AHB2, I immediately thought of the matching HPA4 that colleagues Jaap and Yung were very pleased with."

"The key question, of course, was whether the HPA4 would really provide an audible improvement."

"Well you bet! The synergy between preamp and power amplifier is nothing short of magical, not to mention the DAC3 B that I got from importer Helios for the occasion."

"Not only a few curtains disappear, the whole window is gone."

- Geoffrey Vanhouwaert, Alpha-Audio

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HPA4 - HI-FI+ -

HPA4 - HI-FI+ - "Top 100 Products of the Past 20 Years"

by Benchmark Media Systems December 18, 2019

"Our final round of the best products from the finest brands of the last 20 years, covering products made from early 1999 to 2019."

"Benchmark is perhaps best known for its range of DACs, but the new HPA4 shows just what the brand can do with a take-no-prisoners headphone amplifier design."

"A real game-changer!"

Reviewed by Tom Martin

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HPA4 Review - Peter Pialis, Headphone.guru

HPA4 Review - Peter Pialis, Headphone.guru

by Benchmark Media Systems November 06, 2019

"Since the HPA4 arrived, I have rediscovered so many of my favorite works all over again with improved detail retrieval dynamics and transparency that it’s hard to pull myself away!"

"It drove my power hungry Abyss Phi TC headphones with complete authority, but it was still dead silent and nimble enough to amplify my easy to drive Focal Utopia headphones."

"Rarely have I come across such a wonderfully revealing amplifier that can drive many different types of headphones so darn well! The solid build construction and various controls make the $2,995 price tag seem a bit low based on the other headphone amplifiers in this market space."

- Peter Pialis, Headphone.guru
November 6, 2019
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HPA4 Review - Gary Galo, Audioexpress.com

HPA4 Review - Gary Galo, Audioexpress.com

by Benchmark Media Systems October 31, 2019

"You’ll have a tough time finding a cleaner, quieter, more transparent line amplifier and headphone amplifier anywhere, at any price. I found it to be a new reference. Once I heard it, I could not live without it, so I purchased the review sample. The HPA4 deserves my highest recommendation."

"The HPA4 is the latest product from Benchmark Media Systems, an upstate New York audio manufacturer."

"We think very highly of the products that Benchmark and John Siau, the company's director of engineering, have been launching in the market - and I'm certain our readers share that opinion."

"Benchmark calls it a headphone amplifier, but it’s really two products in one, combining the LA4 Line Amplifier introduced in 2018, with a headphone amplifier. It is also based on the same THX Achromatic Audio Amplifier technology used in Benchmark’s acclaimed AHB2 power amplifier."

- Gary Galo, Audioxpress.com

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DAC3, HPA4, AHB2 System Review - HiFiTest.de

DAC3, HPA4, AHB2 System Review - HiFiTest.de

by Benchmark Media Systems October 30, 2019

"With DAC, preamplifier and power amplifier, Benchmark knows how to build a bridge between the professional sector and home hi-fi. Very beautiful."

"If you value transparent, precise sound, but at the same time want a certain level of comfort and at least a little elegance, you are in good hands with the Americans."

"The DAC3, HPA4 and AHB2 are all characterized by their wonderfully transparent sound and their high degree of precision. At the same time, sufficient amenities are offered to offer adequate comfort. A successful mix."

- HiFiTest.de

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HPA4, LA4 - Lab Report - Amirm, Audio Science Review

HPA4, LA4 - Lab Report - Amirm, Audio Science Review

by Benchmark Media Systems August 05, 2019

Benchmark HPA4 Preamplifier and Headphone Amp Audio Review.jpg

"Going into this test, based on measuring previous Benchmark products, I expected excellent performance. The benchmark HPA4 shattered even that high bar."

"It brings such a high performance to the table that leaves no doubt whatsoever about its transparency. No stone has been left unturned to optimize audio performance of this device. Even obscure measurements like ultrasonic interchannel phase shift is nailed."

"And then we have tons of power without messing with balanced cables and such. Plug in any headphone and you are in heaven."

"The preamp performance is even higher still, breaking and shattering any expectation one would have in a lab instrument let alone a consumer hi-fi."

"It goes without saying that the Benchmark HPA4 garners my strongest recommendation for a headphone amplifier and preamplifier. It doesn't get better than this folks."

- Amir Majidimehr, Audio Science Review

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HPA4 Review - Dan-Alexandru Gheorghe, HeadMania

HPA4 Review - Dan-Alexandru Gheorghe, HeadMania

by Benchmark Media Systems July 07, 2019

"It’s ... been a while since I have been this excited about an audio product."

"Audeze LCD-2C, Quad Era-1, Brainwavz Alara, Sennheiser HD650 ..."

"It’s the first time when I have heard the headphones mentioned above to their full potential. In the first minute my jaw dropped ..."

"From my perspective this is the best headphone amplifier I have ever heard. It’s no competition really."

"It’s not cheap, I can give you that. Is it worth it? That is up to each and every one of you, but if you really want the best amplifier out there, an end game amplifier…this is it."

- Dan-Alexandru Gheorghe, HeadMania.org

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HPA4 Review - Steven Stone, Home Theater Review

HPA4 Review - Steven Stone, Home Theater Review

by Benchmark Media Systems June 26, 2019

"The HPA4 combined with the Benchmark AHB2 power amplifier ranks as the quietest rig I've heard (or not heard). Even with the gain up to full with no signal, there is no hiss, hum, or buzz, even when I placed my ears within a in inch of the drivers on 89 dB sensitive loudspeakers."

"As a headphone amplifier, the HPA4 was first rate. Whether it was my most power-hungry headphones, which currently are the new Abyss Diana Phi, or my most sensitive IERs, such as the Empire Ears Phantoms, there was no added noise or lack of adequate gain."

"The Benchmark HPA4 exhibits virtually no noise, whether employed as a stereo preamp or headphone amplifier, and his highly transparent, with no audible colorations."

"If you are looking for a preamplifier/headphone amplifier that you can live with happily for a long time, you should consider the Benchmark HPA4 at the top of your must-audition list."

- Steven Stone, HomeTheaterReview.com

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HPA4 Review - Sandu Vitalie, Sound News

HPA4 Review - Sandu Vitalie, Sound News

by Benchmark Media Systems June 23, 2019

"Today, is a very special day for me, since I believe I am hearing the best overall performance out of my headphones."

"The distance performance-wise between HPA4 and my second-best headphone amp is Night and Day!"

"This headphone amplifier and line pre-amplifier receives my highest recommendation and scores the highest rank in my book."

"It spoiled me so much, that for the past 3 days I’m waking up at 5 A.M. so I can listen, tap my feet and head-bang just a little bit more. I for one, started saving for one, I’m sorry but I can’t go back to regular amps."

"Without a doubt Benchmark HPA4 is an end-game, top of the line headphone amp – it’s The One to rule them All."

 - Sandu Vitalie, SoundNews.net

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HPA4 Review - Tom Martin, HI-FI+

HPA4 Review - Tom Martin, HI-FI+

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 exceptionally good at presenting a layered, dynamic yet relaxed sound."

"The instruments not only are clearly differentiated but also sound fully rendered, as live instruments do."

"I wish the review sample didn’t have to go back."

- Tom Martin

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AHB2 and HPA4 Review - Ulrike Schwarz, Anderson Audio NY

AHB2 and HPA4 Review - Ulrike Schwarz, Anderson Audio NY

by Benchmark Media Systems May 29, 2019

"The AHB2 power amps ... are fantastic."

"I use them as mono blocks due to my power hungry speakers."

"I hear clarity, precision and an openness in the treble that I haven't heard in my speakers before."

"The HPA4 line and headphone preamp and the power amps are made for each other..."

- Ulrike Schwarz, Anderson Audio NY

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HPA4 - Review - Tom Martin, The Absolute Sound

HPA4 - Review - Tom Martin, The Absolute Sound

by Benchmark Media Systems May 20, 2019

"I thought the HPA4 sounded as good as any headphone amp I’ve heard for dynamic headphones, and it might be the best of the lot ..."

"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."

"... wish the review sample didn’t have to go back."

- Tom Martin, The Absolute Sound

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HPA4 -

HPA4 - "Best Headphone Amplifier" - AV Tech Media Awards 2018/2019

by Benchmark Media Systems January 22, 2019

"The headphone section, with its choice of 6.35 mm stereo or four-pin balanced XLR connectors ... really impresses with a smooth signal delivery."

"While on the one hand it can rock out when it needs to – its prodigious output means it can give as much power as your headphones can take – its sheer impact, openness and vivacity is jaw-dropping."

"An immaculate all-analogue design, the aptly named Benchmark is both technically and sonically as good as it gets."

- AV Tech Media Awards 2018/2019

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HPA4 -

HPA4 - "2018 Product of the Year" - Everything Audio Network

by Benchmark Media Systems January 03, 2019

HPA4 - Top Product of 2018, All Categories

For 2018, Everything Audio Network has selected just one product for the honor of "Product of the Year". That product is the Benchmark HPA4 headphone/line amplifier.

"One of the most transparent audio products I have ever heard at any price"

"Marvelously open and clean"

- John Gatski, Everything Audio Network

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DAC3 B & HPA4 - RMAF 2018 Show Report - EnjoytheMusic.com

DAC3 B & HPA4 - RMAF 2018 Show Report - EnjoytheMusic.com

by Benchmark Media Systems October 15, 2018

"Speaking of reference gear, few names in high-end audio are so closely attached to the reference sound as Benchmark. Their fantastic HPA4 reference amplifier could be found at booths throughout the show. This year, Benchmark was introducing its new DAC3 B."

"I spent some time playing around with the Benchmark pieces, and they really have a high quality pro-audio-like build to them. They're the polar opposite of some of these more DIY-feeling boutique amps and DACs out there – Benchmark has a very professional level of finish on it."

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HPA4 Review - Andrew Everard, Hi-Fi News

HPA4 Review - Andrew Everard, Hi-Fi News

by Benchmark Media Systems October 09, 2018

Hi-Fi News "Outstanding Product" Award

"Benchmark describes its product as a 'reference Stereo Headphone Amplifier and Reference Line Amplifier with Relay Gain and Input Control', which should give you some idea of what's going on here, but only hints at the fact that this is actually two completely separate products packed into one relatively compact unit."

"The headphone section is powered by a power amp from THX, employing the same AAA (Achromatic Audio Amplifier) technology first used by the company in its AHB2."

"Benchmark's line amplifier uses relays for input selection, gain control and muting while four independent 256-step attenuators ... feed the the headphone ... and preamp outputs."

"As PM notes in his Lab Report, this design gives the HPA4 not only outstanding performance, but also rather impressive - to say the least - signal delivery."

"All of a track or two should do the trick, as whether with revealing headphones ... or used as a preamp, the HPA4 simply drops jaws with the sheer impact, openness and vivacity of the way it plays music."

"It was one of those real 'performer in the room' experiences and I was instantly transported back to the time I spent monitoring the recording as it was being made ..."

 - Andrew Everard, Hi-Fi News, November 2018

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HPA4 - Lab Report - Paul Miller, Hi-Fi News

HPA4 - Lab Report - Paul Miller, Hi-Fi News

by Benchmark Media Systems October 09, 2018

"Here's a brand that's aptly named - its products providing a 'benchmark' technical performance. The HPA4 is no exception with its relay-switched stepwise volume attenuator calibrated in 0.5 dB steps over a 'useable' 105 dB range."

"Distortion and noise are vanishingly low."

"The frequency response is ruler flat (+/- 0.01 dB) from 1 Hz - 100 kHz."

"The [line output] source impedance is a sensible 30 Ohms and the maximum output a huge 22 V."

"Via the headphone amp, the maximum voltage is 11.2 V and ... the maximum power output is a substantial 4.4W/25ohm and 7.7W/8ohm."

"So, not only will the HPA4 drive the toughest headphone loads but its ... insignificant -102 dBV (8uV) residual noise also ensures exceptionally quiet backgrounds when listening with the most sensitive headphones/earbuds."

"Distortion is broadly unaffected by loading."

"The source impedance is a low <0.6 Ohms up to 10 kHz, increasing to 0.78 Ohms at 20 kHz."

- Paul Miller, Hi-Fi News
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HPA4 - Review - John Gatski, Everything Audio Network

HPA4 - Review - John Gatski, Everything Audio Network

by Benchmark Media Systems July 31, 2018

HPA4"One of the most transparent audio products I have ever heard at any price"

"Marvelously open and clean" 

"The HPA4 is a co-design by Benchmark and THX, Ltd. using the THX Achromatic Audio Amplifier (AAA™) technology that was implemented in the Benchmark AHB2 amplifier a couple of years ago."

"The HPA4 is sonically neutral, distortion free and deeply dynamic."

"The rotary relay gain control features 256 steps in 0.5 dB increments."

"The key to a superior volume control is how it sounds when you turn it down ..."

"... you should be able to hear the gentle room reverb of drum cymbal or ringing piano note decay as you turn the volume down."

"The Benchmark HPA4 with its precision relay and ultra quiet amp section, sounds the same at reduced levels as it does when it is turned up."

"The Benchmark HPA4 is one of the most transparent headphone amps I have ever heard — at any price. Just as impressive is the line stage, which delivers volume control that many an esoteric analog or digital preamp could only dream of."

"To say I am impressed with Benchmark HPA4 would be an understatement."

"Based on my impressions, the Benchmark HPA4 receives two Everything Audio Network Stellar Sound Awards. One for its headphone amp and one for its line stage. Folks, it is that good."

- John Gatski, Everything Audio Network

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HPA4 Review - Tom's Corner, What's Best Forum

HPA4 Review - Tom's Corner, What's Best Forum

by Benchmark Media Systems July 27, 2018

HPA4 - "The best sounding headphone amp I've heard"

"For the first time in my audio life I can pin my ear to each speaker driver and hear absolutely no sound coming from the speakers in a quiet room with the system volume control at any position from minimum to maximum with no source material playing."


"I find that lowering the background noise paints the music on as black a canvas as possible and thus seems to bring out realistic low-level detail in recordings."

"The Benchmark HPA4 is the best sounding line amplifier I've yet heard. It's innovative approach to controlling system volume/SPL results in what for me is a uniquely transparent-to-source experience."

"It is also the best sounding headphone amp I've heard, both for very-insensitive, hard-to-drive phones and those sensitive enough to easily be used directly from a smart phone."

"The HPA4 truly stands apart in terms of measured and subjectively low background noise and distortion when driving either loudspeakers or headphones."

- tmallin, moderator of Tom's Corner, whatsbestforum.com

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