2/29/2024 0 Comments Using benchmark ahb2 bridged modeIt also keeps the inherent noise level of the amplifier extremely low - down to -132dB A-weighted in Stereo Mode. THX claims that this technology (unlike standard negative feedback topologies) keeps the amplifier very stable even at very high ultra-sonic frequencies so the highs do not sound hard or edgy as they can and do in many other amplifier designs. Because of this technology operating bias current can be kept low while still providing excellent sound quality, greater efficiency and ultimately results in far less heat that needs to be dissipated out of the amp and into the room. The AHB2 employs some global and some local negative feedback to keep the distortion extremely low but perhaps more importantly the amplifier uses THX’s Feed-Forward Technology that applies a different signal to the amplifiers output in the crucial crossover regions I mentioned above. This new AAA™ technology takes a novel approach to virtually eliminating noise and distortion from the amplifier especially in the critical areas where the input signal passes through the zero-voltage point as it swings from positive to negative voltage (crossover distortion) and again at the juncture where the amplifier transitions from Class AB operation to Class H. THX has patented this Achromatic Audio Amplifier technology (AAA™) and applied it in Benchmark’s AHB2 amplifier in a collaborative effort. It uses bi-polar output devices to insure low noise performance and has ultra-wide bandwidth extending from 0.1Hz to beyond 200kHz. The AHB2 amplifier is essentially a Class AB amplifier that moves into Class H operation engaging extra voltage rails when high power is demanded. Burdick will be missed but not forgotten. Unfortunately Burdick passed away in September of 2013 and the AHB2 amplifier is dedicated to the honor of his memory. Burdick was one of the leading innovators in the Pro-Audio Industry and had a life-long passion for advancing the quality of audio reproduction. Burdick, who founded the “Benchmark Sound Company” in Dallas, Texas in 1983 and changed the company name to “Benchmark Media Systems, Inc” in 1985 when he moved the enterprise to Syracuse, New York. Obligatory pics of my system with the lucky transducer.The Benchmark AHB2 amplifier is named for Benchmark’s Founder Allen H. I've been using it with Freya (tubes pulled) in strictly passive mode and have a system that can be used for hours without adding any heat to the room, which is huge since it's still in the 100's in Arizona.įeel free to add your impressions and ask any questions you might have for owners of this excellent power amplifier. I thought Jot had excellent bass response with HE-6 but AHB-2 gives it a little extra weight, yet has all the air and clarity you would expect.īest part about the AHB-2 is that it doesn't even get warm, like, at all. HE-6 though, is definitely more muscular out of the AHB-2. With the dynamics it isn't as warm and smooth, as it's meant to be as transparent as possible. It has possibly better width but slightly less depth than ZD. ![]() I recently compared it to my Zana Deux using HD800 and HD650, which I feel present stage width and depth more accurately than planars and the AHB-2 doesn't give up much of anything in terms of staging. I've spent a lot of time with the AHB-2, almost 6 hours every day for the last week and a half. 11.04" W x 3.88" H x 9.34 " D - Including feet and binding posts.29 A peak, per channel, both channels driven. ![]() 190 Watts per channel into 4 Ohms, both channels driven. ![]()
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