Skykomish, I used to own Model 3's with the 121 c interfaces. As others have said, the speakers need to be plugged in all the time. Acoustats are fairly difficult to drive, although a 50watt tube amp should do the trick. One other thing about these speakers is that they could be damaged by arcing, like most stats. I had a friend with 4's who managed to arc them severely and that was as they say that..:0(
After about ten years with the 3's, I gave up on them and now I never look back.
After about ten years with the 3's, I gave up on them and now I never look back.