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Benchmark AHB2 Power Amplifier
The AHB2 is a radically different audio amplifier. Its patented design delivers performance that approaches the limits of the latest high-resolution audio formats. Benchmark's AHB2 power amplifier delivers musical details without introducing the masking effects of amplifier noise and distortion. The dynamic range of the AHB2 is 132 dB, making it 10 to 30 dB quieter than some of the very best reference-quality power amplifiers.
Unlike class-D amplifiers, the AHB2 is noise free over its ultra-wide 0.1 Hz to 200 kHz frequency range. Don't settle for the limited performance of class-D amplification.
With the AHB2, you will discover previously overlooked nuances, dynamics, and detail in your favorite tracks. Experience the full potential of the very best high-resolution 24-bit PCM and 1-bit DSD recordings.
- Much Faster than Feedback
- Eliminates Zero-Crossing Distortion
- Inherently Stable, Non-Recursive Correction
- Stable into Any Phase Angle
- Stable when Driving Very Low impedances
- No Rise in THD when Driving Low Impedances
- No Rise in THD when Running in Bridged Mono
- Benchmark Exclusive
- Not Available on Any Other Power Amplifier
- 30 to 40 dB reduction in THD
- Keeps THD+N Below 0 dB SPL at All Times
- No "Electronic Fingerprints" on the Music
- Accurate Impulse Response Into all Loads
- 132 dB SNR
- Ultra Wide 0.1 Hz to 200 kHz Response
- Bass is Delivered Without a Phase Shift
- Fast, Distortion-Free Transient Response
- Linear Phase Response
- Accurately Reproduces the Audio Waveshape
- Precise Rendering of Stereo Width and Depth
- Focused 3-D Stereo Image
- Class-AB with Class-H Tracking Rails - High Power, Runs Cool
- No Class-D Amplification - No Ultrasonic Noise
- Tightly Regulated Power Supply with AC Line Conditioning
- Immune to AC Line Noise
- Power Does not Change with Line Voltage
- THD+N Does Not Change with Line Voltage
- Complete Monitoring of Current, Voltage, THD, and Temperature
- No Performance-Compromising Protection Circuits in the Signal Path
- Lightning-Fast Tweeter Protection if THD Exceeds 2%
- Noise-Free Electronic Mute Under Fault Conditions
- Fault And Clip Indicator Lights
- 100 W Stereo – Generous Power for Most Applications
- 380 W Mono – Suitable for Large Rooms or Extreme SPL Levels
- Nearly a 4X Power Increase in Bridged Mono
- No increase in THD when Running in Bridged Mono
- Flexible Upgrade Path – Start with Stereo, Upgrade to Bridged Mono
- On/Off Momentary Switch
- Indicator Off - Power is Off
- Indicator On - Power is On
- Indicator Flashing - Fault Condition, Protection Enabled, Power Disabled
- Off - Normal
- Flash - Clip
- On - Speaker Protection Enabled Due to Excessive Clipping
- Off - Normal
- Flash - Peak-Current Warning
- TEMP On and POWER On - Over-Current Protection Enabled
- TEMP On and POWER Flashing - Over-Temperature Protection Enabled
- Off - Normal
- On - Audio is Muted
- Support Studio or HiFi Input Levels
- High CMRR for Noise Immunity
- Support Benchmark RCA to XLR Adapters
- Up - 2V RCA Source (with Adapter)
- Center - 4V HiFi XLR Source
- Down - +22 dBu Studio XLR Source
- High-Current NL2/NL4 Twist-Lock Connectors
- Better Electrical Connection than Binding Posts
- Quick and Easy Operation
- No Risk of Shorts or Polarity Reversals
- Dedicated Bridged-Mono Output Connector
- Up - Bridged Mono
- Down - Stereo
- Unit Mutes when Switching Modes
- Bidirectional Operation
- Work with all Single and Dual Direction Trigger Ports
- Time Delays Allow Noise-Free System Startup and Shutdown
- Standard 3-Pin IEC Connector
- Fuse Drawer with Two Fuses
- Auto-Ranging
- 50-60 Hz
- Insulated to Comply with Safety Regulations
- Accept Bare Wire, Spades, or Banana Plugs
- Use SpeakON Outputs for Highest Performance
- International Certifications
- Safety Tested
- Production Monitored
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Professional Reviews 91/100
Deliciously Crispy
Sound Quality
90/100
Build Quality
93/100
Value for Money
89/100
Sound Quality
90/100
Build Quality
93/100
Value for Money
89/100
The transparent, low-noise Benchmark AHB2 is built for listeners who want the amplifier to vanish and the music to stay brutally honest. StereoNET United Kingdom praised its cool-running versatility, while Alpha Audio and Soundnews highlighted its speed, grip, and precision. Bridged mono adds real scale for tougher speakers.
What Reviewers Are Saying
Pros
Extremely transparent and low in noise, with a near-disappearing, highly resolving character.
Delivers fast, tightly controlled dynamics with strong bass grip and punch.
Offers precise imaging and strong separation, especially with revealing speakers.
Compact, cool-running, and highly versatile, with bridging, gain options, and pro-style connectivity.
&
Cons
Its tonal balance can feel neutral to the point of sounding less lush or warm than some listeners may prefer.
Soundstage depth is good, but not always class-leading versus the best reference amplifiers.
SOUND QUALITY PERFORMANCE 90/100
Reviewers consistently praise the AHB2 for extreme clarity, low noise, and a very direct, uncolored presentation. It is repeatedly described as transparent, fast, and highly resolved, though a couple of reviews note that its tonal palette can feel a little limited and its stage depth is good rather than class-leading.
Transparency Resolution
93/100
This is the amp’s standout trait in the reviews. Writers call it a near-disappearing amplifier with a pure musical signal, world-class detail retrieval, very low distortion, and a level of cleanliness that makes it seem like the source is being heard more directly.
Tonal Balance Musicality
85/100
The AHB2 is generally described as neutral, honest, and easy to live with, with some reviewers appreciating its creamy, rounded character and lack of fatigue. At the same time, one review felt the palette of colors was somewhat limited and another noted it is not lush, mellow, or warm, so it sounds more accurate than especially rich or forgiving.
Dynamics
92/100
Reviewer comments point to strong grip, fast transient response, and plenty of authority, including praise for heavy, controlled bass and an ability to shrug off difficult speakers. The bridged mono configuration is repeatedly linked to notably more power and scale, with one review highlighting impressive dynamic transients and another describing it as broad-shouldered and gutsy.
Soundstage Imaging
88/100
The imaging is widely described as precise, with exemplary separation, good layering, and a wide, open presentation. Depth is the mild reservation: one reviewer said the amplifier was not as deep or spacious as a reference design, and another found it two-dimensional without added processing, so spatial performance is strong but not uniformly spectacular.
SOUND QUALITY PERFORMANCE 90/100
Reviewers consistently praise the AHB2 for extreme clarity, low noise, and a very direct, uncolored presentation. It is repeatedly described as transparent, fast, and highly resolved, though a couple of reviews note that its tonal palette can feel a little limited and its stage depth is good rather than class-leading.
Transparency Resolution
93/100
This is the amp’s standout trait in the reviews. Writers call it a near-disappearing amplifier with a pure musical signal, world-class detail retrieval, very low distortion, and a level of cleanliness that makes it seem like the source is being heard more directly.
Tonal Balance Musicality
85/100
The AHB2 is generally described as neutral, honest, and easy to live with, with some reviewers appreciating its creamy, rounded character and lack of fatigue. At the same time, one review felt the palette of colors was somewhat limited and another noted it is not lush, mellow, or warm, so it sounds more accurate than especially rich or forgiving.
Dynamics
92/100
Reviewer comments point to strong grip, fast transient response, and plenty of authority, including praise for heavy, controlled bass and an ability to shrug off difficult speakers. The bridged mono configuration is repeatedly linked to notably more power and scale, with one review highlighting impressive dynamic transients and another describing it as broad-shouldered and gutsy.
Soundstage Imaging
88/100
The imaging is widely described as precise, with exemplary separation, good layering, and a wide, open presentation. Depth is the mild reservation: one reviewer said the amplifier was not as deep or spacious as a reference design, and another found it two-dimensional without added processing, so spatial performance is strong but not uniformly spectacular.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
93/100
Reviewers praise the AHB2’s compact, well-made chassis, cool-running operation, and thoughtful professional-minded engineering. Its balanced inputs, gain options, bridgeable mono operation, trigger integration, protection systems, and self-test behavior all contribute to a sense of serious, highly functional execution, even if one reviewer notes it lacks some luxury flair.
Value for Money
89/100
The value comments are broadly favorable for a $3,499-class amplifier. Reviewers describe it as delivering an awful lot at its price, worth every penny, and offering a lot more in return, even though the asking price is clearly acknowledged as substantial rather than cheap.
Build Quality
93/100
Reviewers praise the AHB2’s compact, well-made chassis, cool-running operation, and thoughtful professional-minded engineering. Its balanced inputs, gain options, bridgeable mono operation, trigger integration, protection systems, and self-test behavior all contribute to a sense of serious, highly functional execution, even if one reviewer notes it lacks some luxury flair.
Value for Money
89/100
The value comments are broadly favorable for a $3,499-class amplifier. Reviewers describe it as delivering an awful lot at its price, worth every penny, and offering a lot more in return, even though the asking price is clearly acknowledged as substantial rather than cheap.
Reviews
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Authorized dealers for Benchmark AHB2 Power Amplifier
- The Music Room — online and in-store — Erie, Colorado, United States (website)
- 110Hz — online and in-store — Kielce, Województwo świętokrzyskie, Poland (website)
- Acton Gate Audio — online and in-store — Cymru, United Kingdom (website)
- Alto Music — online and in-store — Middletown, New York, United States (website)
- Atlas Pro Audio, Inc. — in-store — Sun City Center, Florida, United States (website)
- Audio Advisor — in-store — Michigan, United States (website)
- Audio Extreme — in-store — Kowloon, China (website)
- Audiolab Stereo & Video — online and in-store — Morrisville, Pennsylvania, United States (website)
- AUDIOPHONICS — in-store — Bordeaux, Nouvelle-Aquitaine, France (website)
- B&H Photo — online and in-store — New York, New York, United States (website)
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