Reviews

DAC3 - Receives Stereophile's Highest "Class A+" Rating

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

"All I can say is Wow!"

- John Atkinson

LA4 - Receives Stereophile's Top Rating for Preamplifiers

"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

HPA4 - Receives Stereophile's Top Rating for Headphone Amplifiers

"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

AHB2 - Receives Stereophile's Top Rating for Power Amplifiers

"An extraordinary amplifier."

- John Atkinson

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

- Kalman Rubinson

DAC3 - Receives Stereophile's Highest "Class A+" Rating

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

"All I can say is Wow!"

- John Atkinson

HPA4 - Receives Stereophile's Top Rating for Headphone Amplifiers

"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 - Receives Stereophile's Top Rating for Preamplifiers

"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

AHB2 - Receives Stereophile's Top Rating for Power Amplifiers

"An extraordinary amplifier."

- John Atkinson

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

- Kalman Rubinson

AHB2 - Receives Stereophile's Highest "A" Rating for Power Amplifiers

"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."

- Stereophile, 2023

"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

LA4 - Receives Stereophile's Highest "Class A" Rating for Preamplifiers

"Benchmark's usual approach to design is to out-spec the competition, and so it is here. Like other Benchmark equipment he has tested, the affordable LA4 challenged the resolution of John Atkinson'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

"In his listening room, Kalman Rubinson compared the LA4 to a cable—and couldn't hear any difference. He concludes, '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.'"

- Stereophile, 2023

DAC3 HGC, DAC3 B - Receive Stereophile's Highest "Class A+" Rating

"The DAC3 B is a stripped- down, lower-priced version of the DAC3 HGC, which omits the headphone amplifier, balanced and unbalanced analog inputs, volume, mute, and polarity controls." - Stereophile

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

"All I can say is Wow!"

- John Atkinson

"In a Follow-Up, JCA wrote of using the Benchmark processor with the same company's AHB2 power amp—a combination of high source output voltage and modest amplifier gain that he describes as 'optimal for minimizing noise and distortion' —and reported hearing 'richer and more interesting' reproduction of very subtle details."

- Stereophile

HPA4 - Receives Stereophile's "Class A" Rating for Headphone Amplifiers

"The HPA4 adds a THX888 amplification stage to Benchmark's LA4 line preamplifier  to allow it to drive even low-impedance headphones with aplomb."

"It keeps the LA4's balanced and single-ended preamplifier outputs and adds a headphone output on a 4-pin XLR jack and a single-ended headphone output on a 1/4" jack."

- Stereophile, 2023

"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

DAC3 B and AHB2 - Driving Laufer Teknik Note Line Array

Two AHB2 bridged-mono amplifiers were driving the 4-Ohm line arrays (48 drivers per side).

"Sound was extremely well-integrated and controlled, and the bass memorable."

"The Note received signal through Benchmark Media's AHB2 power amps, DAC3 B D/A processor, and interconnects."

Two DAC3 B Converters - One for the Array, and One for the Subs

Two AHB2 Power Amplifiers - Bridged Mono Mode - One per Array

"The system sounded super on a 16/44.1 file of the famed rendition of Copland's Fanfare for the Common Man, recorded by Eiji Oue and the Minnesota Orchestra for Reference Recordings."

- Jason Victor Serinus, Stereophile Magazine

DAC3 B - Receives Stereophile's Highest "Class A+" Rating

"I never auditioned the DAC3 HGC in my own system, so when I got an opportunity to borrow a sample of the DAC3 B, I eagerly agreed."

"I had been using MBL's network-connected N31 CD player/DAC ($18,680 with Roon Ready module) before installing the DAC3 B."

"The MBL offers an excellent sense of drive and low-frequency impact, but when I replaced it with the Benchmark, both these aspects of the music seemed enhanced."

"Whether it was an orchestral bass drum or a kickdrum, electric bass guitar or acoustic double bass, the MoFi speakers seemed to acquire more low-frequency weight without losing definition."

- John Atkinson

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

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