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Benchmark AHB2A

Power Amplifier


True High-Resolution Performance 
The AHB2 is the ideal match to the performance limits of High-Resolution-Audio (HRA) 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. The frequency response of the AHB2 extends beyond 200 kHz. With the AHB2, you will discover previously overlooked nuances, dynamics, and detail in your favorite recordings and experience the full potential of the latest high-resolution 24-bit PCM and 1-bit DSD audio formats.

Experience the Emotion
The musical details and emotion captured on today's finest High-Resolution-Audio recordings can only be fully appreciated when every component in the signal chain is capable of true high-resolution performance. Power amplifiers are a weak link in most audio systems. Most power amplifiers are well matched to the limitations of the CD format, but they fall well short of the capabilities of high-resolution formats. In contrast, the revolutionary AHB2 was specifically designed to deliver true high-resolution performance.

D/A conversion technology has outpaced the development of new power amplifiers. This means that the power amplifier has become a limiting factor in many audio systems. For example, the noise and distortion produced by the Benchmark DAC2 D/A converter is 20 to 30 dB lower than that produced by most high-quality power amplifiers. Until now, this meant that the DAC2 could not be fully appreciated. Benchmark set out to solve this problem by creating an amplifier that matches the performance of the DAC2.

We had to look beyond existing amplifier technologies and explore some new and radical solutions. In our search, we learned of two new patents on a new amplifier technology from THX. This was exactly the technology we needed to build our new amplifier. The AHB2 uses the new and revolutionary THX-patented AAA(TM) technology to virtually eliminate all forms of distortion. This technology uses feed-forward error correction to eliminate the distortion that is normally produced by the output stage.  No other audio amplifier comes close to delivering the clean, quiet, and robust power of the AHB2. In our quest, we also focused on frequency response, output noise, drive current, damping factor, and reliability. The result is an amplifier that stands head and shoulders above the competition.

The Quietest, Cleanest Audio Amplifier on the Planet
From the first watt to the last watt, no audio power amplifier offers lower noise or lower distortion than the Benchmark AHB2. Benchmark has raised the bar by introducing a new and revolutionary amplifier!
“I measured less distortion and noise in the AHB2 than in any other of the many power amps I've measured over the years.”
Bascom King, BHK Labs

“If ever there were a giant-killer of an amp, this is it.”
"It is one of the -- if not the -- quietest, most resolving amps I've heard. Time and again, without ever having intended to, I wound up hours deep in listening to the fringes of my music collection, thanks to the AHB2’s reference-level transparency and obscene athleticism."
Hans Wetzel, SoundStage!


Output Power - 1 kHz, < 0.0003 % THD+N
- 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
- 200 Watts Bridged Mono into 16 Ohms
- 380 Watts Bridged Mono into 8 Ohms
- 480 Watts Bridged Mono into 6 Ohms
All speakers have variations in input impedance. Select loads based on nominal impedances not minimum impedances.

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, inputs shorted
- 7.1 uV, A-weighted, Stereo Mode
- 9.8 uV, A-weighted, Mono Mode

Noise Power Relative to 1 Watt - Output noise power, inputs shorted
-115 dB Watts, A-weighted, 16-Ohm Load, Stereo Mode
-112 dB Watts, A-weighted, 16-Ohm Load, Mono Mode
-112 dB Watts, A-weighted, 8-Ohm Load, Stereo Mode
-109 dB Watts, A-weighted, 8-Ohm Load, Mono Mode
-111 dB Watts, A-weighted, 6-Ohm Load, Stereo Mode
-108 dB Watts, A-weighted, 6-Ohm Load, Mono Mode
-109 dB Watts, A-weighted, 4-Ohm Load, Stereo 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

- 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
- 18 A peak, per channel, both channels driven
- 18 A peak, protection shut-down threshold

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
- Mute Sequencing
- Distortion Detection
- Short Circuit Detection
- Over Current Detection (18 A peak)
- Over Temperature
- SOA (Output device safe operating area)

- 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

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

€ 3599.00