Switching power supplies are much more efficient, and smaller, than linear transformer based supplies but traditional designs (or wall-warts) are noisy and can affect power demand. The switching is carried out at frequencies well above the audio band to reduce any audible artifacts from the power supply. The AHB2 has a resonant zero-voltage switching power supply. Benchmark’s clever design compensates for this with the Class A amplifier. To provide high current on demand the H rails have to shift between stages which can ripple through as distortion. Here again the battle is between efficiency and distortion.
The Force also works on the H Class power rail system. In addition, there’s a 3D amplifier that boosts the input signal in 3 selectable levels. The Force runs in parallel with the regular AB amplifier attack fleet and corrects mistakes and shores up any weakness caused by non-linearity in the transition stage. To win this battle the rebel alliance, i.e., THX and Benchmark, are trusting The Force (my name – not the official designation) in the shape of a low power Class A correction amplifier. The Dark Side in the amplifier war is distortion and heat. Class H tracking rails deliver power on demand unlike linear power supplies that must have stand-by capacity. AB amplifiers are more efficient than Class A by utilizing a push-pull transition.Ĭlass AB has two circuits to increase efficiency over A – straight amplification – and class B where ½ of the signal is used. It’s basically an AB amp with a class H power rail arrangement. The AHB2 is an attack on current amplifier design. Achromatic may mean colorless or neutral or without modulation. The design is called Achromatic Audio Amplifier. THX has patented a novel amplifier design, THX AAA Technology TM and Benchmark Media Systems has turned it into a new power amplifier – AHB2.
BENCHMARK AHB2 SMPS POWER SUPPLY MOVIE
The company is a technology spin-off from Lucasfilm, which originated the Star Wars movie series. There’s a new actor in the high end audio amplification field – THX.
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