Thanks Larry for the feedback. I'm planning an amplifier upgrade for this coming year and after some research, most likely will be one of Frank's. i haven't decided yet between a FET Valve 600R or the new DVA 4/2 ( like the biamp option). I'm looking for tight bass with control, quickness and authority (using Maggies). Midrange not seems to be a concern with AVA amps, but will like to have a full bodied sound without loosing dynamics, retrieval detail, and natural extension in the treble. My hearing I susceptible to poorly reproduced cymbals, high hat, and other metallic percussion instruments. Hard to find these sound qualities in the same unit!