I thought I needed a lot of power for my Maggie 3.6's and had a 540 watt class D. The room would shake and it was fun to show off but no way to listen to music that loud for long. I have 60 watt Pass class A amps with powered subwoofers. Much more musical, I don't need to make the room shake any more so there is plenty of power for my listening levels. There is enough power to make the Maggies come alive when I want to open them up for a short while and the inner detail and blackness of the background is really appreciated with the Pass amps. And I have found that the pre-amp makes a bigger impact on the quality of sound at higher levels than the amplifiers. A big amp makes a noisy pre amp sound more noisy especially when it is driven.