Benchmark AHB2 Silver - right front
Benchmark AHB2 Silver - top front
Benchmark AHB2 Black - right front low angle
Benchmark AHB2 Silver - right front closeup
Benchmark AHB2 Black top front
Benchmark AHB2 Black right front closeup
Benchmark AHB2 Silver Rackmount top front
Benchmark AHB2 Black Rackmount top front
Benchmark AHB2 Rear
Benchmark AHB2 rear panel
Benchmark AHB2 dimensions
Benchmark AHB2 Rackmount dimensions
AHB2 Output Waveform at 1 Watt
Benchmark AHB2 Silver - right front
Benchmark AHB2 Silver - top front
Benchmark AHB2 Black - right front low angle
Benchmark AHB2 Silver - right front closeup
Benchmark AHB2 Black top front
Benchmark AHB2 Black right front closeup
Benchmark AHB2 Silver Rackmount top front
Benchmark AHB2 Black Rackmount top front
Benchmark AHB2 Rear
Benchmark AHB2 rear panel
Benchmark AHB2 dimensions
Benchmark AHB2 Rackmount dimensions
AHB2 Output Waveform at 1 Watt
Benchmark AHB2 Silver - right front
Benchmark AHB2 Silver - top front
Benchmark AHB2 Black - right front low angle
Benchmark AHB2 Silver - right front closeup
Benchmark AHB2 Black top front
Benchmark AHB2 Black right front closeup
Benchmark AHB2 Silver Rackmount top front
Benchmark AHB2 Black Rackmount top front
Benchmark AHB2 Rear
Benchmark AHB2 rear panel
Benchmark AHB2 dimensions
Benchmark AHB2 Rackmount dimensions
AHB2 Output Waveform at 1 Watt

Benchmark AHB2 Power Amplifier

Regular price
$3,499.00 USD
Sale price
$3,499.00 USD
Regular price
$3,499.00 USD
Shipping calculated at checkout.
Unique Patented Technology
Quietest, Cleanest Amplifier on the Planet!
Top Awards
Proven Bulletproof Reliability
Drives Difficult Loads with Ease
Style: Silver
Faceplate:
In Stock
155 In Stock

SKU: 500-18000-100

Recommendations

Stereophile

"Benchmark Media Systems' AHB2 is an extraordinary amplifier. Not only does its performance lie at the limits of what is possible for me to reliably test, it packs high power into a very small package, especially when used in bridged-mono mode. It is truly a high-resolution amplifier."

- John Atkinson, Stereophile
Continue Reading
Stereophile 2025 Recommended Components  Logo
Future Audiophile

"Less distortion and noise than any other power amp I’ve measured over the years"

- Bascom King, BHK Labs, SoundStage!
Continue Reading
Sound Stage Hifi .com Recommended Reference Award
Stereo Times

"The Benchmark performance continues to engage me, and the company gives me confidence in long-term support. I never get tired of listening with the Benchmarks. Found a home in my system."

- Don Shaulis, Stereo Times
Continue Reading
The Stereo Times Publishers Choice 2022 Award

The Benchmark AHB2

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.

Technology of the AHB2

Feed-Forward Error Correction

  • 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
Learn More

Patented THX-AAA Technology

  • 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
Learn More

Extended Frequency Response

  • 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
Learn More

Unique Features

  • 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
Learn More

Bulletproof Protection Circuits

  • 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
Learn More

Bridged-Mono Switch

  • 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
Learn More

Best of the Best

The Benchmark AHB2 delivers the lowest noise and lowest distortion available at any price.
This performance is achieved using a unique, patented technology that sets it apart from competition. In many ways, the Benchmark AHB2 is radically different than traditional amplifiers. It has earned many top industry awards in recognition of its performance and innovation. It can be found on Stereophile's top list of "recommended components".

The AHB2 is known for its natural sound, and it has earned a reputation for proven, bulletproof reliability. Additionally, the Benchmark AHB2 can effortlessly drive the most difficult speaker loads without exhibiting an increase in THD.
Benchmark AHB2 with a silver front panel on a rustic wooden box

Listening Experience


The Benchmark AHB2 delivers a clear, open, and uncluttered playback across the entire frequency range.

Instrumental overtones are rendered with exceptional precision and realism. Vocals are reproduced with outstanding accuracy and natural tones. Transients are fast and precise. Bass is deep and well controlled.

The ultra-linear phase response of the AHB2, allows it to create a precise three-dimensional rendering of the recorded space. This space is open and uncluttered because noise and distortion are held below the 0-dB SPL threshold of hearing at all playback levels.
From the first watt to the last watt, the AHB2 delivers a clear image of the musical performance. Pure excitement, no distractions.
Benchmark AHB2 on a rustic wooden box

Awards

Front Panel

Benchmark AHB2 Front Panel View
POWER
  • On/Off Momentary Switch
  • Indicator Off - Power is Off
  • Indicator On - Power is On
  • Indicator Flashing - Fault Condition, Protection Enabled, Power Disabled
CLIP Indicators
  • Off - Normal
  • Flash - Clip
  • On - Speaker Protection Enabled Due to Excessive Clipping
TEMP Indicators
  • Off - Normal
  • Flash - Peak-Current Warning
  • TEMP On and POWER On - Over-Current Protection Enabled
  • TEMP On and POWER Flashing - Over-Temperature Protection Enabled
MUTE Indicators
  • Off - Normal
  • On - Audio is Muted

Rear Panel

Benchmark AHB2 Rear Panel
Two Balanced XLR Inputs
  • Support Studio or HiFi Input Levels
  • High CMRR for Noise Immunity
  • Support Benchmark RCA to XLR Adapters
3-Position SENSITIVITY Switch
  • Up - 2V RCA Source (with Adapter)
  • Center - 4V HiFi XLR Source
  • Down - +22 dBu Studio XLR Source
Three SpeakON Outputs
  • 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
MODE Switch
  • Up - Bridged Mono
  • Down - Stereo
  • Unit Mutes when Switching Modes
Two 12V TRIGGER I/O Ports
  • Bidirectional Operation
  • Work with all Single and Dual Direction Trigger Ports
  • Time Delays Allow Noise-Free System Startup and Shutdown
AC Input
  • Standard 3-Pin IEC Connector
  • Fuse Drawer with Two Fuses
  • Auto-Ranging
  • 50-60 Hz
Binding Posts
  • Insulated to Comply with Safety Regulations
  • Accept Bare Wire, Spades, or Banana Plugs
  • Use SpeakON Outputs for Highest Performance
TUV Safety Certification
  • International Certifications
  • Safety Tested
  • Production Monitored

Additional Information

Manual

Detailed specifications and performance plots are available in the downloadable manual.

AHB2 Manual

AHB2 Application Notes

AHB2 App Notes

Reviews

AHB2 Reviews

Continuous Average Output Power

< 0.0003 % THD+N at full rated power, 20 Hz to 20 kHz

  • 100 Watts per channel into 8 Ohms, both channels driven
  • 130 Watts per channel into 6 Ohms, both channels driven
  • 190 Watts per channel into 4 Ohms, both channels driven
  • 240 Watts per channel into 3 Ohms, both channels driven
  • 259 Watts per channel into 2 Ohms, both channels driven
  • 200 Watts into 16 Ohms, bridged mono
  • 380 Watts into 8 Ohms, bridged mono
  • 480 Watts into 6 Ohms, bridged mono
  • 518 Watts into 4 Ohms, bridged mono

All speakers have variations in input impedance. Select loads based on nominal impedances not minimum impedances. The AHB2 is stable into all loads. The AHB2 is conservatively rated at an output level where THD+N is < 0.0003 % instead of the more typical 1% THD+N. Power at 1% THD will be higher.

Output Voltage Into Various Load Impedances

< 0.0003% THD+N at the following output voltages and load impedances, 20 Hz to 20 kHz

  • 29.03 dBV, 31.25 dBu, 28.28 Vrms into 8 Ohms, both channels driven
  • 28.92 dBV, 31.14 dBu, 27.93 Vrms into 6 Ohms, both channels driven
  • 28.81 dBV, 31.03 dBu, 27.57 Vrms into 4 Ohms, both channels driven
  • 28.57 dBV, 30.79 dBu, 26.83 Vrms into 3 Ohms, both channels driven
  • 27.14 dBV, 29.36 dBu, 22.76 Vrms into 2 Ohms, both channels driven
  • 35.05 dBV, 37.27 dBu, 56.57 Vrms into 16 Ohms, bridged mono
  • 34.83 dBV, 37.05 dBu, 55.14 Vrms into 8 Ohms, bridged mono
  • 34.59 dBV, 36.81 dBu, 53.67 Vrms into 6 Ohms, bridged mono
  • 33.16 dBV, 35.38 dBu, 45.52 Vrms into 4 Ohms, bridged mono

Use dBV to calculate the peak SPL from your speaker/amplifier combination. Use the following formula: Amplifier output voltage in dBV + speaker sensitivity at 2.83V - 9 dB. Example: (29.03 dBV at 8 Ohms) + (90 dB SPL @ 2.83V 1m) - 9 dB = 110 dB SPL at 1 meter

SNR & Dynamic Range

Rated output relative to output noise, inputs shorted

  • 132 dB A-weighted, Stereo Mode
  • 135 dB A-weighted, Mono Mode
  • 130 dB Unweighted, 20 Hz to 20 kHz, Stereo Mode
  • 133 dB Unweighted, 20 Hz to 20 kHz, Mono Mode

Noise Voltage

Output noise voltage, A-weighted, inputs shorted

  • -103 dBV, -101 dBu, 7.1 uVrms, Stereo Mode
  • -100 dBV, -98 dBu, 9.8 uVrms, Mono Mode

Use dBV to calculate the SPL of the noise produced by your speaker/amplifier combination. Use the following formula: Amplifier output noise voltage in dBV + speaker sensitivity at 2.83V - 9 dB. Example: Mono mode driving very high efficiency speakers: (-100 dBV) + (104 dB SPL @ 2.83V 1m) - 9 dB = -5 dB SPL at 1 meter. This means that the system noise will be 5 dB below the threshold of hearing when driving speakers with a very high 104 dB efficiency. The noise will be even further below the threshold of hearing when driving typical speakers.

Noise Relative to 2.83 Vrms (1 Watt into 8 Ohms)

Output noise relative to 2.83 Vrms, A-weighted, inputs shorted

  • -112 dB, Stereo Mode
  • -109 dB, Mono Mode

THD+N

1 kHz, 80 kHz LPF, at full rated output into any rated load

  • < -118 dB (< 0.00013%), Stereo Mode
  • < -118 dB (< 0.00013%), Mono Mode

THD

1 kHz, 20 kHz LPF, at full rated output into any rated load

  • < -119 dB (< 0.00011%), Stereo Mode
  • < -120 dB (< 0.00010%), Mono Mode

Crosstalk

  • Better than -115 dB at 1 kHz
  • Better than -92 dB at 20 kHz

Frequency Response

  • Better than 0.1 Hz to 200 kHz, +0/-3 dB
  • -0.01 dB at 20 Hz, -0.17 dB at 20 kHz, 8-Ohm Load
  • -0.23 dB at 20 Hz, -0.32 dB at 20 kHz, 4-Ohm Load

Damping Factor

  • 350 at 20 Hz, 8-Ohms
  • 254 at 1 kHz, 8-Ohms
  • 34 at 20 kHz, 8-Ohms
  • 7 at 200 kHz, 8-Ohms

Maximum Audio Output Current

  • 29 A peak, per channel, both channels driven

Input Sensitivity

  • Low-Gain = 22 dBu (9.8 Vrms), Gain = 9.2 dB
  • Mid-Gain = 14.2 dBu (4 Vrms), Gain = 17.0 dB
  • High-Gain = 8.2 dBu (2 Vrms), Gain = 23 dB
  • Use Mid-Gain or High-Gain settings for unbalanced inputs
  • Unbalanced inputs require RCA to XLRM adapter cables

Input Impedance

  • 50 k Ohms, normal mode
  • 1 M Ohm, common mode

Input CMRR

  • 80 dB at 20 Hz, typical
  • 80 dB at 1 kHz, typical
  • 65 dB at 20 kHz, typical

Trigger I/O

  • 12 VDC 200 mA current-limited output to trigger turn-on of remote devices
  • DC input for slaving to remote devices
  • Input responds to 3.3 V logic and higher, VIL = 1.26 V, VIH = 2.7 V
  • Absolute maximum input voltage = 30 VDC
  • Absolute minimum input voltage = -0.3 VDC
  • Input Impedance = 20 k Ohms

Protection Circuits

  • Fully Electronic, No Relays
  • Mute Sequencing
  • Distortion Detection
  • Short Circuit Detection
  • Over Current Detection
  • Over Temperature Detection
  • SOA Detection (Output device safe operating area)

Dimensions

Non-rack-mount version:
  • 11.04" W x 3.88" H x 9.34 " D - Including feet and binding posts
  • 11.04" W x 3.47" H x 8.33 " D - Excluding feet and connectors
  • Faceplate height is 2RU
Rack-mount version:
  • 19.00" W x 3.88" H x 10.62 " D - Including binding posts, handles and removable feet
  • 19.00" W x 3.47" H x 8.33 " D - Excluding feet and connectors
  • 9.09" rack depth, including binding posts, excluding cables
  • 11" rack depth, including cables
  • Faceplate height is 2RU

Weight

  • 12.5 lbs., 16 lbs. shipping - Non-rack-mount version
  • 13.5 lbs., 17 lbs. shipping - Rack-mount version

AC Input

  • Auto-ranging AC Input
  • 100 to 120 VAC +/- 10%, 8 Amps, 50 - 60 Hz
  • 220 to 240 VAC +/- 10%, 8 Amps, 50 - 60 Hz
  • Idle Power Consumption = 20 W
  • Standby Power Consumption < 0.5 W

Overall rating: 4.991667 / 5 from 120 reviews.

AI Generated Review Summary

The Benchmark AHB2 Power Amplifier offers unmatched sonic purity, low distortion, and high efficiency, making it ideal for high-resolution audio formats. Its innovative design and exceptional performance have earned it numerous awards and accolades. The AHB2 delivers detailed, dynamic, and transparent sound, providing a superior listening experience. With a focus on minimizing noise and maximizing power, it stands out as a top choice for audiophiles seeking the best in class performance.

Summary topics

  • Sound Quality: 31%
  • High-Fidelity Sound Reproduction: 6%
  • System Performance: 10%
  • Sound Detail and Balance: 9%
  • Music Quality and Clarity: 10%

Review topics: [].

Review highlights

  • "Can now hear my music in greater detail, clarity, and the bass is wonderful."Tom K.
  • "The AHB2 powered them effortlessly and the sound was fast, transparent, and astonishingly clear!"Shankar K.
  • "I no longer have to turn the music up loud to enjoy it and feel blessed to own such a system."Tom K.

Reviews

Amazing product

"Some keywords why I love AHB2 and all other products from Benchmark: ***** Amazing measurements ***** The products' reliability ***** The products' small form factor and great looks ***** Comprehensive user manuals with lots of measurements ***** Great value for money. ***** Benchmark's excellent customer service ***** Benchmark is a company with integrity (anti snake oil)"

Hallvard A. (5/5)

Not my first benchmark product

"Not my first benchmark product but probably my last. I’m not saying it’s bad in anyway I just don’t think I will ever find a product that will beat the trueness of sound. Last month I treated myself to a full Benchmark set up, a new Dac 3 L and an ABH 2. And with the cable deal a set of 25 foot speaker cables. My intention was to use it with a pair of ls3/5a and I will say the authority and grip was something I had never heard on the little Falcon Acoustics. The next speaker to bring in to play was a pair of retro vintage WE 755a, I know tubes are gospel, 300B running single ended. But this full Benchmark system taught me a thing or two about distortion, I don’t like it anymore. This new dac, amplifier combo has eliminated it. It is so clean and quiet, no hum, no strange pops. Great sound stage, maybe not the widest on all recording, but it’s clear it’s the recording not the set up. It’s even fooling my cats. Tapping foots in recordings are making them look to the area below the speaker, weird. My purchase started out to just say thank you to a great company I just wanted to support in these hard times. Turned out to be an eye and ear opener that’s making my foot tap and a big smile on my face."

Thomas L. (5/5)

It took a while to

"It took a while to get up and running however with Rory’s expertise, all is well. I appreciate that he took the time to check the compatibility between my speakers, preamplifier and your amplifiers. We spent a good amount of time on the phone doing this."

Nicholas P. (5/5)

How My 2. 7i's MAGGIE's Came To Life

"When I purchased the 2. 7i's I also purchased a tube Preamplifier to pair with the 75 watt tube amp I already owned, knowing I would definitely need to increase my amplification power for these speakers. At that time the speaker was so new there were no amplifier recommendations. I retired at the end of October in 2025 and decided to use that occasion to complete my audio system and room. I did my research and decided that the amplifier that I felt would give me the results that I wanted would be 2-AHB2's (Monoblock) by Benchmark Media Systems. I again worked with The Music Room as well as Benchmark Media Systems. I was so impressed by Benchmarks products that I traded in my Tube Preamp and purchased a Benchmark LA4 Line Amplifier too. How do they sound? The way something sounds is always unique to the listener. The 2. 7i's sound is very natural and non fatiguing to me. I have a musical background and my goal was to get as close to the original performance as possible, I think I am as close as I can get with my current ears. I have been listening non stop to music that I thought I knew every sound on the recording and I have be hearing little things that I hadn't heard before! Very subtle things like soft harmonies or percussion. They obviously are there, they were just covered up by the noise in my previous system. The Benchmark AHB2 is so quiet and powerful it does what I want my amplifier to do: Amplify the performance only for me please. Benchmark You Did It!"

Bill (5/5)

This is my third AHB2.

"This is my third AHB2. I have a pair running bridged-mono running a difficult to drive speaker pair in one system. This runs in stereo driving a relatively easy to run pair of speakers. IMO this is the perfect HIFI Power Amplifier. Quality and fidelity are amazing and can drive any speaker."

Kelly B. (5/5)

"I love this amp! If you want a boring clean amp with super darkness and no sound signature this is the amp to get!!"

Kenneth (5/5)

Already had 1 unit for

"Already had 1 unit for stereo playback. Bought it from B & H Photo 1 year ago. This 2nd Benchmark amp I just bought completes my desire for mono blocks. Works great!! Crisp, clean, and powerful. Want to thank you again for making such an amazing amplifier! Gratefully yours. . . . . . . . . . David F. - Oyster. Bay, NY"

David F. (5/5)

Currently I mix with either

"Currently I mix with either Paradigm Se3-mini or custom Dynaudio speakers, both of which are wonderful but have dynamic and drive limitations. With this powered amplifier, I don't need to push the speakers nearly as hard. The clarity is instantly improved, and the ear fatigue is almost totally gone."

Dan G. (5/5)

The Benchmark AHB2 is a

"The Benchmark AHB2 is a high-performance, ultra-low-distortion power amplifier known for its exceptional noise floor and transparency. It’s designed to reveal the finest details in music by acting as a neutral conduit rather than adding color, though its revealing nature can highlight flaws in recordings. It uses advanced THX-AAA technology for clean power and stability. It’s compact, efficient, and offers powerful bridged mono operation, making it a benchmark for clean, accurate audio reproduction in both studio and home setups, especially when it’s paired with reference-level DACs and preamplifiers like the Benchmark DAC3 and the Benchmark LA4. Bottomline, the Benchmark AHB2 is a “holy grail” amplifier because its performance comes remarkably close to the theoretical ideal of a “straight wire with gain”."

Thomas Y. (5/5)

Awesome.

"Amazing amplifier! Clarity is amazing and it has no trouble driving power hungry speakers. A HUGE plus is the compact size which makes it easy to put on a bookshelf or in a small vented cabinet."

Justin (5/5)

Q&A

The Benchmark Product Line

Benchmark ... the measure of excellence! ®
  • Benchmark AHB2 on a rustic wooden box

    Power Amplifiers

    The AHB2 sets the benchmark for the lowest noise and lowest distortion in a power amplifier ... at any price.

    Power Amplifiers
  • Benchmark LA4 on a rustic wooden box

    Hi-Fi Preamplifiers

    Benchmark preamplifiers are designed to accept and deliver studio-level balanced output signals, but they also deliver state-of-the-art performance when operating at HiFi signal levels which are typically 10 dB lower.

    Hi-Fi Preamplifiers
  • Benchmark DAC3 L on a rustic wooden box

    Digital to Analog Converters

    High-Resolution Playback Begins with an External D/A Converter

    Digital to Analog Converters
  • Benchmark Studio&Stage™ cables on a rustic wooden box

    Cables

    Benchmark Studio&Stage™ professional audio cables deliver the high performance required for studio applications while delivering the durability to withstand the most demanding live sound applications.

    Cables
5.00 from 350+ reviews

Designed for Accuracy, Built for Transparency

We are passionate about audio quality.
Benchmark LA4, DAC3 B, and AHB2 on a rustic wooden rack.