I haven't made the comparison, but I'll soon be comparing the Benchmark LA4 preamplifier with the Boulder 1012...
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Just keep in mind the ABH2 only offers up 100w into 8ohms and 200w into 4ohms and 380W into 4ohms if running bridged mono. You’re very much likely to trip the amps protection circuits if you’re driving it into sub 4ohm loads since when running in bridges mode the amp is seeing half that.
Peronally I wish benchmark offered a more powerful version but Perhaps if they did that they couldn’t stick to the “Benchmark” philosophy of having the best stats on the market. There are trade offs with any design of any piece of electronic equipment.
The aforementioned uber amps, by constellation, pass labs, Solution tend to offer much more wattage and stability into 1ohm loads. Not even sure if the abh2 is stable into 1ohm, let alone 2ohm in stereo mode.