![]() If you have more questions, talk to me at AES, or post questions here. This was an important design goal because ultrasonic noise can be folded into the audio band by non-linearities in speaker transducers. ![]() A-weighted noise is only 2 dB less than noise measured over an 80 kHz bandwidth. For this reason, it produces very little out-of-band noise. The AHB2 is a linear amplifier, it is not a switcher. Power drawn on one channel does not influence the power available from the other channel. Linear Stereo Amplifier Passive cooling Bipolar output stage Class AB Dynamic range: 132 dB Up to 29 A peak in parallel on each channel THX-patented feed. Peak power does not vary with AC line voltage (due to regulated supply). Nevertheless the AHB2 is much more efficient than a conventional class AB design. It was not optimized for the highest possible efficiency that can be achieved with this new topology. The AHB2 design was optimized for low distortion and low noise. In many ways, the AHB2 is a radical departure from conventional class AB amplifier design:ġ) Low gain (9 dB) - allows +22 dBu input at amplifier clip - essential for low noiseĢ) Patented feed-forward error correction - virtually eliminates crossover distortionģ) Feed-forward design makes bias currents unnecessary, and non-critical - class B operation is possible with very low distortionĤ) Multiple output stages run in parallel to eliminate crossover distortion - one output stage is active while another is in the crossover regionĥ) Class AB output stage uses very low bias currentĦ) Due to low bias currents, idle power consumption is only 20 Wħ) Feed-forward design makes class H or G operation possible - no rise in distortion at class H or G switch pointĨ) Class H (or G) rail switching at a 1/3 power thresholdġ0) High-bandwidth control loop on switch-mode power supply responds to amplifier loading over the entire audio band, and at ultrasonic frequenciesġ1) Amplifier does not rely on capacitive energy storageġ2) Switch-mode power supply eliminates AC line magnetic interference to levels that are not possible with a linear power supplyġ3) >200 kHz bandwidth to achieve excellent inter-channel phase at 20 kHz.ġ4) < 0.1 Hz low frequency cutoff to minimize low-frequency phase shiftġ5) Feed-forward design improves damping factor Are you still liking the AHB2 Headphones/IEMs: Hifiman Susvara, Sennheiser HD600, Final A8000. Stage opened up, tonality was overall more controlled, just all round better. Whereas on the AHB2 its tight, punchy, brilliant. After all, the performance of the D/A converter is only useful if it can be delivered by the downstream power amplifier. On the 789, the lowend sounded floppy and loose. It was my goal to create a power amplifier that matched the performance of the DAC2 D/A converter. I recognized phases and sequences of words that had appeared in prior reviews, and yet the text was new, original, and well written. For those of you who will not be attending the AES show, I will attempt to outline the engineering decisions that went into the AHB2. I asked ChatGPT to review the Benchmark AHB2, and I was shocked at the results It turns out that ChatGPT wrote a review by gleaning information from the many publicly available reviews of the AHB2. I will be at the AES 2013 show in NYC and would be happy to discuss the new technologies incorporated into this new amplifier. Thanks for the questions and comments about our new AHB2 power amplifier.
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