It will be ever-so-slightly more laid back but the other enhancements are worth it.
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I bought my old dna-1 with the rev A already done. It was a wonderful solid state amp. Very very powerful with the signature DNA pronounced bass. I preferred this amp to the sound of the krell fpb series and older levinson 27 series. I had heard dna's several times before, and I think what the A rev gave it was a clearer, more transparent sound with a little less 'haze'. There was still a little, tiny bit of haze compared to my pass labs amps which replaced it, but so does every other solid state amp. Best bass I've ever gotten out of an amp. One of the best amps out there. Period! Also, if you are running Vandersteens, this is the best match I've ever heard, solid state or tube. Interestingly enough, I would say it's general sound is closer to a vt100 than anything else. Didn't have the tube magic or pure midrange, but did have the gutsy bass mixed with a sense of presence.