My amps are not at the level of your ARCs, but when I switched from my modified Dyna/VTA 70 stereo amp to twin modified Dyna/VTA 70 stereo amps used as single channel monoblocks a couple of years ago, I experienced much the same audible phenomenon you did....same tonal balance, notably wider deeper, (and taller) soundstage. Subtle....yes, but on a revealing system that you're very familiar with, it's certainly noticeable with no sonic disadvantages. A win for sure.
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