I've recently been looking at purchasing a Peavey Max Bass 700. I would be running it through a 4 ohm Peavey 412tvx. The head would be putting out 475 watts at that impedence. Would that be loud enough to play with 2 guitarists, one using a 160 watt 2x12 and the other using a 120 watt 2x12 and still have plenty of headroom? I also noticed while looking at the amp that it has a power amp in. Does that mean that I could buy a seperate power amp and hook that into it and have that power added to it?