I'm using my Eden WT-550 through a 15" JBL and two Epifani 10" cabinets and I'm confused as I have very little headroom left. In most situations, and granted I'm competing against two guitars, my pre-gain knob is at 2 o'clock (just where clipping begins at the loudest notes), and my master-gain is up around 3 or 4 o'clock...almost at its max. This amp is rated at 500 watts at 4 ohms, 620 at 2, and i'm probably running around 2.6 with my three seperate 8-ohm cabs...so it would seem to me that this thing should be kicking some butt, not maxed out. My old amp, a Gallien-Kreuger 800RB seemed to do fine and it's only 300 watts at 4 ohms. I know amps are different and it may not be possible to compare things directly, but I feel like a 500-620 watt Eden should only need to be turned up around half-way, not completely maxed. Am I missing something or do I need a different amp???