I generally agree with Meiwan - most critical is placement some distance into the room. I have mine on a diagonal about 3 ft from the wall - and they're about 7 ft apart (after a good deal of trial and change). I like the target stands - sand filled.
As for power amps - I'm not sure they're that particular but they need a lot of power. My amps are rated 400w/c @4 ohms and do nicely IMHO. I once drove them with a tube amp rated at 35 watts as a test, and just for fun. It was really, really nice, but only at low volume - this would not suffice for music with high dynamics.
Search the archives for more discussion on amps . . . there has been a fair amount of it.
As for power amps - I'm not sure they're that particular but they need a lot of power. My amps are rated 400w/c @4 ohms and do nicely IMHO. I once drove them with a tube amp rated at 35 watts as a test, and just for fun. It was really, really nice, but only at low volume - this would not suffice for music with high dynamics.
Search the archives for more discussion on amps . . . there has been a fair amount of it.