I'm now running two systems in my house with ARC VT100s, both with ProAc speakers--Response 2s in my study and 3.8s in my living room. I played around for a while in my living room with big Martin Logans (Prodigy) and with small Martin Logans (Aeons), but they didn't really have the slam I wanted for rock. Mind you, they were astonishing with vocals. I auditioned a bunch of other speakers, but ultimately ended up thinking how good the study system sounded and went out an picked up the 3.8s. There is something magic about ARC & ProAc.