S1, in regard to amplification, I have heard the Q3's in the same room with the same amps and front end equipment as the S5's (ie: Dart, Soulution & Vitus). To clarify, I think the Q3 is the better sounding speaker in technical terms. It uses all-Nano-Tec drivers, a better crossover, better cabinet etc. I was making 3 main points. Firstly that imho the Q3 is not "much better" than the S5 as Alon described. My second main point was that, imho the S5's are better "all rounders" with a wider variety of music, applications, systems, and rooms (being easier to place than Q3). And thirdly, that I believe the S5's have better (deeper, more solid) low & mid bass (which is so important in creating a foundation in music). Though remember ultimately it comes down to musical preferences and system synergy. I can understand why some customers would prefer the Q3, and others would prefer the S5. They are quite different, but in technical terms not that far apart.