Thanks Wayne, I was listening to a band at a local club the other night and was thinking that the 4's were as close to sounding like a live band as I have ever been able to get at home. I'm still lacking some "punch" and "clarity" so I was wondering if an amp with a "pro" lineage might be just what I needed. The pendulum is swinging back from flea powered SET listening to "wake the neighbors rockin" and I am amazed that all of my Pi's (Tower 2's, Theater 4's and 6's) sound great either way! BTW, do you have any One PI kits ready to go? I am ready to build a pair to serve as replacements for the Thiels as rear surrounds.