In agreement with Rip, a well made 100watt amp will be more than enough for the average room and speakers. Only when you start trying drive planar speakers such as Magnepans, Logans, Quads, ect. Magnepan MMG's driven by a 35 Watt Monarchy Audio SM-75, never heard it clip before. However consider that the MMG's don't go that low in bass, thus lowering the power requirments. But also consider that they have a sensitivity of like 84db. So just imagine a "normal" speaker with a sensitivity of like 91-92db. Even less power needed. These poeple that buy 250+ Watt amps for a normal (less or equal to) 12x12 room are crazy!