As Wayne said, sensitivity is mid 80s, but this is at 4 ohms (if memory serves me.) I think 200wpc (clean power at 4 ohms) should be about right, if you really want to rock out.I have a pair of MMG-W, and they do just fine on a 35 wpc PP tube amp. No, they are not going to bring the house down, but they sound dead-on for small jazz ensambles and uncluttered classical.....Colin