Presently, I’m using Ypsilon Hyperion monoblock amplifiers. They are the best that I have heard, but they should be, given the price. My second favorite was the Lamm M2.2 monoblock amplifiers. Both of these are about 220W hybrid amplifiers. Personally, I think that the Sound Labs need at least 200W; I think the maximum power that’s recommended is around 600W, so I wouldn’t go above that.