Is it dangerous to run my amp at 2.67 ohms. I have a 700 watt Peavey Firebass700 head. I'm running a 4 ohm 4x10, and a 4 ohm 1x15. Does this damage anything? Also are both cabs the same loudness? It seems to me that the 4x10 is louder, but it is hard to tell, because which ever one you are at ear level with sounds louder.