![]() The tracking rails provide efficiency that approaches that of a class-D amplifier while entirely avoiding the noise and distortion produced by class-D designs. The class-AB amplifier operates inside of class-H tracking rails that are also fully linear. It uses a parallel structure that includes a class-AB amplifier and a class-A feed-forward correction amplifier. The audio path in the AHB2 is an entirely linear design. If the amplifier is over driven, the protection system mutes the output before tweeter damage can occur. ![]() Advanced protection system with real-time monitoring of all system parameters including output distortion.The exceptionally low magnetic emissions allow a compact package without compromising the noise performance. The high frequency design allows internal filtering that does not interfere with the audio bandwidth. The high frequency operation eliminates large line-frequency transformers that emit large magnetic fields. Switching power supply operating well above the audio band (above 500 kHz).This provides predictable peak power and voltage at the outputs. Tightly regulated power supplies provide constant voltage to output stages under all load conditions.Class-H tracking rails extend output power and voltage while maintaining high efficiency.Patented THX AAA low-distortion topology.Linear class-AB amplifier with parallel class-A feed-forward amplifier.Very low out-of-band noise (the AHB2 is not a class-D amplifier).Very low magnetic emissions, may be stacked with other equipment.Maximum peak output current: 29 A, both channels driven.Frequency response 0.1 Hz to 200 kHz +0/-3 dB.THD at 1 kHz, full rated power, mono mode: ![]() THD at 1 kHz, full rated power, stereo mode: A-weighted output noise: -100 dBV, -98 dBu, 9.8 uVrms, Mono Mode.A-weighted output noise: -103 dBV, -101 dBu, 7.1 uVrms, Stereo Mode.Less than 0.0003 % THD at full rated power, 20 Hz to 20 kHz.The protection system controls the following: "I measured less distortion and noise in the AHB2 than in any other of the many power amps I've measured over the years.” One independent test lab had this to say about the AHB2: Last but not least, the FPGA-based protection system in the AHB2 provides the robust protection necessary in a laboratory environment. The extended bandwidth provides the precise phase response that their application requires. The -3 dB bandwidth extends from 0.1 Hz to 200 kHz with an exceptionally flat response. ![]() Distortion is virtually non-existent, even when heavily loaded with low impedances. The AHB2 offers a solution that is more than 15 dB quieter than other top-quality high-end amplifiers. They needed an amplifier with exceptionally wide bandwidth, low noise, low output impedance, low distortion, and bulletproof overload protection. In late 2016, SEAS contacted Benchmark about the possibility of using the AHB2 power amplifier in a laboratory environment. "A Benchmark AHB2 amplifier is used, which has excellent signal-to-noise ratio and bandwidth, low output impedance, and is suitable for laboratory use (with advanced overload protection)." "Is the AHB2 suitable for laboratory use?" This new measurement system was documented in the December 2017 Journal of the Audio Engineering Society (link in references).Īccording to the AES paper, the SEAS team selected the Benchmark AHB2 for the following reasons: They created an innovative test system that measures loudspeaker motor strength and moving mass with higher accuracy than previous methods. ![]() SEAS, a well-known manufacturer of high-quality loudspeakers, selected the Benchmark AHB2 as a key component for use in testing loudspeakers. SEAS driver test system uses Benchmark AHB2 ![]()
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