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Benchmark AHB2 Power Amplifier variant 1

Benchmark AHB2 Power Amplifier

Name: Benchmark AHB2 Power Amplifier
Brand: Benchmark
SKU: 500-18000-100
Rating: 4.6 (23 reviews)

View at Benchmark

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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Overall Score 92/100

Deliciously Crispy

Benchmark AHB2 Power Amplifier — compact, ultra-clean power

Compact yet ferocious, the Benchmark AHB2 blends studio-grade engineering with musical immediacy. Its ultra-low distortion and class-leading dynamics (THD well below 0.00013%, SNR ~132–135 dB) give a neutral, highly transparent sound: taut, tightly controlled bass, clear midrange and a smooth, non-fatiguing treble. Reviewers from Constantine Soo, Mike Prager and Sandu Vitalie praise its transient speed, imaging and ability to drive tricky loads—especially when bridged to mono for very high output. The AHB2’s rock‑solid construction, extensive protection circuitry, SpeakON outputs and rackable 2RU form make it equally well suited to studio use or high‑end two‑channel systems. For listeners who prioritize resolution, headroom and reliability, the AHB2 is a compelling, long‑term proposition.

Dagogo

"My audition of the Benchmark Media AHB2 amplifiers underscores the reason Dr. West is so taken by it, and confirms the design is best described as a watershed moment in the high-end audio industry."

Future Audiophile

"Once you have heard a high-powered, ultra-clean amplifier, it’s hard to go back."

Soundnews

"This is not only a very good amp at making music, but also an invaluable tool when assessing new gear."

StereoNET United Kingdom

"Benchmark's AHB2 is a class act that delivers an awful lot at its price."

Audiophilepure

"I think with the revolutionary THX Achromatic Audio Amplifier Technology, the Benchmark AHB2 deserves precisely that."

Alpha Audio

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

Pros

Reference-level transparency and ultra-low noise deliver exceptional detail retrieval and imaging.
Substantial power and blistering transient control—bridged mono yields very high output and drives difficult speakers without audible compression.
Compact, well‑engineered build with comprehensive protection, studio-friendly connectors (SpeakON) and flexible gain/mono switching.

Cons

Very neutral, reference‑style voicing; users seeking added warmth or lush coloration from tube designs may find it too clinical.
Balanced‑only inputs and a somewhat tight rear‑panel layout mean adapters or careful cable choices may be required for some systems.

Sound Quality

94/100

Dynamics

96/100

Exceptional headroom and current delivery are both measured and heard: specs show 100 W/ch stereo into 8 Ω and up to 380 W bridged mono into 8 Ω, 29 A peak output current and extremely low THD/N (<0.00013%). Reviewers repeatedly praised its slam, transient speed and ability to drive difficult loads without compression (Soundnews: “dynamic range behemoth”; Dagogo: organ transients and power approaching much pricier monoblocks; Future Audiophile: effortless peaks). High damping factor (350 @ 20 Hz) and reviewers' reports of unflappable control support a top-tier dynamics score.

Soundstage Imaging

90/100

Consistently praised for clear imaging, wide stage and precise layering (Future Audiophile: 'soundstage was wide, images distinct'; Soundnews: 'precise layering and positioning'). Dagogo and others noted excellent separation and ambience; StereoNET observed very good immersion though depth was not quite as expansive as some high-end tube monoblocks. Overall, the AHB2 conserves and often enhances spatial cues, especially with low-noise operation.

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Build Quality

88/100

Robust, compact, cool-running design with studio-friendly features: magnetically shielded chassis, thick panels, 2RU form factor and thoughtful protection circuitry. Internals include bipolar output transistors and the THX AAA topology; reviewers praised the industrial-quality construction and quiet thermal behavior (Future Audiophile, Soundnews, Alpha Audio). Score reflects excellent engineering and practical versatility (bridging/mono operation) though it lacks the visual luxury of some premium chassis designs.

Value for Money

90/100

Reviewers place the AHB2 in a justified-premium category for its measured and audible performance: typical reported pricing ranges from ≈€2,999/$2,999 up to $3,499 in reviews, while the amp delivers 100 W/ch stereo and up to 380 W bridged mono with reference-grade THD/SNR. Multiple reviewers called it 'worth every penny' or 'a class act at its price' and compared its dynamics and clarity favorably to much pricier designs (Dagogo referenced a $28k Bricasti M28), plus Benchmark’s five-year U.S. warranty and comprehensive protection add to the value proposition—hence a strong score for value relative to its competitive segment.