I did do some research on power amp ss and tube. my speaker can be bi-amp i useing a 75watt rms old sansui g-8000 receiver and boy do they sound good but i want much more power. between 250 to 400 watts rms. the used amps I was looking at are mcintosh mc 352- bryston 4 b sst- hafler 9500- rotel rb 1090- parasound hca 3500-now the amps some people rave are pass lab- mark L-krell- and etc I dont want to spend nor do I have that type of money. and if I go with bi amp I was thinking of a used crown k2 and a used music reference tube amp so what amp give u the most bang 4 your buck and wont put me in the dog house or poor house If this help I have a pionner spec 1 preamp and my speakers are below