I've only had the chance to listen to these in the shop, and then with different amps, an all BAT system with the big tube monoblocks for the 3A, and an all CJ system for the Quatros. The Quatros had a more transparent midrange, with a deeper more layered soundstage, tighter bass, and more treble detail, but with less warmth than the 3As. The Quatros seemed to steer a mid course between the warmth of the 3As and the etched highs of so many hi-fi speakers. The 3As are taller, and that affects the soundstage height. The 3As have a looser bass sound that I rather liked, actually, giving them a warm and full sound. They seem to image easily with the "good enough" audio shop placement. I probably *should* have tried the 3As at home first, but I went for broke and the Quatros are on their way. Other than the sound, I like bass range EQ and the adjustable "Q" of the bass response. That will help with getting good bass response that, hopefully, won't also bother the neighbors.