BENCHMARK AHB2 Stereo Power Amplifier Silver

3/4 front view of BENCHMARK AHB2 New
The Benchmark AHB2 power amplifier is a powerful class AH/B amplifier capable of delivering up to 2x 190W at 4 Ohm, and up to 1x 380W at 8 Ohm when bridged in mono. What makes the Benchmark AHB2 so special is its high efficiency and very low distortion and noise levels. In fact, it uses THX AAA (Achromatic Audio Amplifier) technology with forward error correction and a low-noise power supply stage.

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BENCHMARK AHB2 Class A/B Stereo Power Amplifier 2x190W 4 Ohm Silver

Photo of Benchmark AHB2 power amplifier

The Benchmark AHB2 power amplifier is a powerful class AH/B amplifier capable of delivering up to 2x 190W at 4 Ohm, and up to 1x 380W at 8 Ohm when bridged in mono. What makes the Benchmark AHB2 so special is its high efficiency and very low distortion and noise levels. In fact, it uses THX AAA (Achromatic Audio Amplifier) technology with forward error correction and a low-noise power supply stage.
The power supply stage features an SMPS switching power supply with 90% efficiency. In terms of measurements, we find an SNR and an exceptional dynamic range of 132dB (A-weighted) in stereo mode, and a THD+N of less than -118dB (<0.00013%). In terms of connectivity, it features a balanced stereo XLR input, speaker terminals and speakON connectors, as well as two 3.5mm jack trigger 12V connectors. The rear panel also features a gain control switch and a switch for selecting mono or stereo use. All in all, this amplifier, capable of exploiting the full potential of high-resolution audio streams, will let you enjoy every nuance and sonic detail of your favorite tracks.

Benchmark AHB2: class A/B and class H amplifier stage with patented THX AAA™ technology

The AHB2's amplifier stage uses THX's patented AAA™ technology, which enables the cancellation of zero-crossing errors. The AHB2 amplifier then surpasses the performance of any class A amplifier with ultra-low noise and distortion and energy efficiency that rivals that of a class D amplifier. This is complemented by a direct-acting error correction system that allows class AB and class H topologies to be combined.

Benchmark AHB2: easy management of hard-to-drive speakers

The AHB2 easily handles difficult phase angles and low impedances. This allows you to couple the AHB2 to any active loudspeaker and drive them serenely without producing measurable distortion. The high damping factor enhances bass for an immersive experience while maintaining a flat frequency response.

Benchmark AHB2 : feed-forward error correction

Traditional Class A/B amplifiers generate cross-distortion when the push-pull output stage exceeds 0 volts. Class A amplifiers have solved this problem by sacrificing their efficiency, meaning they consume a lot of energy for too little power retransmitted to the loudspeakers. The AHB2 amplifier solves this problem without sacrificing efficiency.

Cross-distortion diagram AHB2 distortion comparison diagram

Benchmark AHB2: an innovative low-noise power supply

The AHB2 power amplifier uses an actively regulated SMPS switching power supply. As a result, the AHB2's maximum output power does not vary according to mains voltage or audio load. This power supply switches beyond audible frequencies to eliminate mechanical noise and interference. As a result, this amplifier benefits from an extremely clean and quiet power supply, with an efficiency rate of over 90%. This efficiency allows it to use passive radiators without the need for a fan.

Benchmark AHB2: low-gain design

Thanks to its low-gain design, the AHB2's maximum output is reached only when the balanced inputs reach a level of +22dBu. This greatly improves the AHB2's SNR, making it 20dB to 30dB quieter than most power amplifiers on the market. A gain switch on the rear panel will still allow you to set the AHB2 to higher gain values if required.

Benchmark AHB2: speakON output connectors

In addition to the standard connectors found on all power amplifiers, the AHB2 features speakON connectors with rotary locking for high-fidelity connection.

Photo of speakON connectors

Benchmark AHB2 power amplifier overview

AHB2 power amplifier connector diagram
1Speaker terminals
2IEC power supply
32x Trigger 12V
4Mono output on speakON connector
5Stereo output on speakON connectors
6Stereo input on XLR connectors
7Gain adjustment
8Mono/stereo selector switch

Test du Benchmark AHB2 par Audio Science Review (Amir)

"Using standard binding posts reduces performance just a bit but certainly nothing to worry about. What we have is still state of the art and one of best ever consumer stereo amplifiers produced."
Logo Audio Science Review

Technical characteristics

Specifications
Product typePower amplifier
Amplification typeClass A/Bandt class H
Inputs1x Balanced XLR stereo input
OutputsSpeaker terminals
1x speakON stereo output
1x Mono speakON output
Output power
(THD+N <0.0003%, 20Hz-20KHz)
2x 100W @ 8 ohm
2x 130W @ 6 ohm
2x 190W @ 4 ohm
2x 240W @ 3 ohm

1x 200W @ 16 ohm (mono)
1x 380W @ 8 ohm (mono)
1x 480W @ 6 ohm (mono)
Output voltage into various load impedance29.03dBV, 31.25dBu, 28.28 Vrms into 8 Ohms
28.92dBV, 31.14dBu, 27.93 Vrms into 6 Ohms
28.81dBV, 31.03dBu, 27.57 Vrms into 4 Ohms
28.57dBV, 30.79dBu, 26.83 Vrms into 3 Ohms
27.1 dBV, 29.36dBu, 22.76 Vrms into 2 Ohms

35.05dBV,  37.27dBu,  56.57Vrms into 16 Ohms, mono
34.83​​dBV,  37.05dBu,  55.14Vrms into  8  Ohms, mono
34.59 dBV,  36.81dBu,  53.67Vrms into  6  Ohms, mono
33.16dBV,  35.38dBu,  45.52Vrms into  4  Ohms, mono
SNR and dynamic range132dB, A-weighted, stereo mode
135dB, A-weighted, mono mode

130dB, Not-weighted, 20HZ-20KHz, stereo mode
133dB, Not-weighted, 20HZ-20KHz, mono mode

Noise voltage-103dBV, -101dBu, 7.1uVrms, stereo mode
-100dBV, -98dBu, 9.8uVrms, mono mode
THD+N< -118 dB ( < 0.00013 %), stereo mode (1kHz, 80kHz LPF, at full rated output into any rated load)
-118 dB ( < 0.00013 %), mono mode (1kHz, 80kHz LPF, at full rated output into any rated load)
THD< -119 dB ( < 0.00011 %), stereo mode (1kHz, 20kHz LPF, at full rated output into any rated load)
< -119 dB ( < 0.0001 %), mono mode (1kHz, 20kHz LPF, at full rated output into any rated load)
CrosstalkBetter than -115dB à 1kHz
Better than -92dB à 20kHz
Frequency responseBetter than 0.1Hz à 20 kHz, +0/-3 dB
-0.01dB à 20Hz, -0.17dB à 20kHz, charge de 8 ohms
-0.23dB à 20Hz, -0.32dB à 20kHz, charge de 4 ohms
Damping factor350 at 20 Hz, 8 ohms
254 at 1kHz, 8 ohms
34 at 20kHz, 8 ohms
7 at 200kHz, 8 ohms
Maximum audio output current29A peak (per channel, stereo)
Input sensitivityLow-gain = 22dBu (9.8Vrms), Gain = 9.2dB
Mid-gain = 14.2dBu (4Vrms), Gain = 17dB
High-gain = 8.2dBu (2Vrms), Gain = 23dB
Input impedance50k Ohms,normal mode
1M Ohm, common mode
ProtectionsNo relay
Silent sequencing
Distortion detection
Short circuit detection
Overcurrent detection
Overtemperature detection
SOA detection (safe operating area of output device)
General
Power supply100 to 120V AC +/- 10 %, 8 A, 50-60 Hz
220 to 240V AC +/- 10%, 8 A, 50-60 Hz
(automatic selection)
Power consumption20W
Standby power consumption< 0.5W
Dimensions280 x 985 x 237.2mm
Weight5.67
ColorSilver
Package1x Benchmark AHB2 power amplifier
1x 3.5mm jack to 3.5mm jack cable (Trigger)
1x Power supply cable
 
Data sheet
InputXLR
OutputSpeaker terminal
OutputSpeakON
ColorSilver
Channel2 (Stereo)
Channel1 (Mono)
ClassClass A / AB
Amplifier chipN/A
Power (W)190.0
Remote ControlNo
 
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BENCHMARK AHB2 Class AB Stereo Power Amplifier 2x190W 4 Ohm Silver
The Benchmark AHB2 power amplifier is a powerful class AH/B amplifier capable of delivering up to 2x 190W at 4 Ohm, and up to 1x 380W at 8 Ohm when...

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