Benchmark AHB2 High-Resolution Power Amplifier
#1 in Stereo Amplifiers · Rated 4.8
Ultra-low-noise, high-resolution stereo power amp
Benchmark’s AHB2 is a compact stereo power amplifier designed for ultra‑clean, high‑resolution listening. It uses a feed-forward error-correction approach (THX-AAA) to suppress distortion and noise, delivering extremely low noise floor and superb dynamic range. In stereo, it provides 100W per channel into 8 ohms (190W into 4 ohms) with measured THD+N around 0.0003% at 1kHz, and a reported SNR well into the 130+ dB territory. The amp is compact enough for small-to-mid‑sized racks and is praised for its transparency, speed, and ability to drive demanding loudspeakers with ease. Designed, assembled, and tested in the USA, it remains a reference for many audiophiles seeking uncluttered, high‑fidelity power delivery. Ideal pairing exists with high‑efficiency loudspeakers and with preamps that preserve signal integrity. What sets it apart is its extraordinary low noise, high damping, and very wide bandwidth, making it a standout value in the premium class. This unit is widely reviewed, cited for its sonic purity, and regularly recommended by audiophile press. Sources: Benchmark AHB2 price (B&H), THX-AAA tech and specs (Benchmark history), Stereophile recommendation notes. ([bhphotovideo.com](https://www.bhphotovideo.com/c/product/1010349-REG/benchmark_ahb2_high_resolution_power_amplifier.html/includes))
Features
- 100Wpc into 8 ohms; 190Wpc into 4 ohms; 380W bridged mono
- THX AAA-based feed-forward error correction
- Extremely low noise floor and distortion
- 50k input impedance; 1 MΩ common mode rejection
- Compact 11" W × 3.88" H × 9.34" D chassis
Pros
- Exceptional low-noise, transparent, high-resolution sound
- Relatively compact footprint for a high‑quality power amp
- Solid build with USA assembly
Cons
- Moderate power into very low-impedance loads vs multi‑kW mono blocs
- Requires a quality preamp to unlock full potential