Feedback loops can only correct errors after they occur. They are built with bipolar output transistors and a unique feed-forward error correction system which is much faster than traditional feedback systems. These are stereo amplifiers with a bridged-mono option which is how I operated them. But a pair is not needed for all applications. In a growing field of 5-figure amplifiers, a pair tops out at $5,998.
BENCHMARK AHB2 SPECIFICATIONS PLUS
A final checkmark in the plus column completed a trifecta. Another Class-D trait they shared that I found attractive is their size and weight at only 12.5 pounds each despite a very solid build quality. I was impressed by the high power rating paired with claims of power efficiency rivaling Class-D power amplifiers. I had never heard of Class-H before, and my curiosity was piqued. Burdick.īenchmark AHB2 amplifiers are Class-H. The AHB2 amplifiers bear the initials honoring the company’s founder, Allen H. Praise from a local Sound Lab dealer and a local Sound Lab owner effectively twisted my arm to the point where I yielded to temptation to try the amplifiers with the somewhat strange name. I was led to Benchmark Media Systems through recommendations from Roger West, the designer of Sound Lab speakers. I do not mean to disparage all Class-D amplifiers, and I have great hope for them in the future, but those I have tried so far were not a great match for the capacitive load of my electrostatic speakers (Quad and Sound Lab). With those amplifiers, there is no extended warranty, and their design “superiority” is temporary, only waiting for the next Class-D “breakthrough.” For those enjoying Class-D amplification, congratulations, you are winners. I have not heard of any gallium nitride offerings, but I am hesitant because many Class-D amplifiers are from small companies or one-man shops with no guaranteed succession plan. I would cue up a favorite track with anticipation and be let down every time. They would do everything right except make music. I was consistently amazed that amplifiers that were so dynamic, clean, and detailed could be so uninvolving. There was always some intangible element lost that failed to make them truly engaging. I have heard, recently but not the most recent, Class-D amplifiers. I had considered some highly rated Class A/B amplifiers, but price points and heavy weights left me disappointed. Power without control is like a 60’s muscle car that can’t hang the corners. But Sound Labs can present a challenging load. It was exactly past experience with these conditions that sent me in search of a powerful but cool-running amplifier for my Sound Lab 545PX loudspeakers (reviewed here ). Many record-breaking days followed later in the summer. Most of the country was under a record-setting heatwave with desperate pleas to conserve energy and protect the power grid.
My AC was struggling to maintain with little pretense of gaining. It was the first day of summer with a predicted temperature of 104F and many hotter days to follow. It wasn’t a dark and stormy night when I sat down to start writing this review. Benchmark Media Systems AHB2 Amplifiers by Don Shaulis
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