Hello all. I am thinking about picking up a Peavey Max 700 head (guitar center has used but warranteed ones for $485). It is listed as being able to run in 8, 4 or 2 ohms. Does anyone know if it is a switch on the back of this amp that changes the ohms, or if you have to plug in another cab to the ohms down to 4 or 2. I am wondering because I have a 4 ohm ampeg cab and I was wondering if I could just plug this peavey in and be able to play at 4 ohms (I need the volume). also, what is the opinion on this amp? I have read good things about the durability and sound. I play mostly hard rock with a spector euro. Is this amp going to give me the aggressive, upfront tone needed for my style of music? I am buying it pretty much as a backup and an amp that I would use at home (I have an EBS TD650 at my band's rehearsal area). Thanks for your time.