ok... first off I'm sorry about asking this question. I just have to figure this crap out ok so say you have. 2 cabs that run at 400 watts at 8 ohms so right there is 16 ohms right? well then what if you run a head through them that is 400 watts at 4 ohms. What is the watts I could push out of that. and do I run a hazord of frying/blowing the cabs if I turn it up to mid/large crowd shows. like 500-600 people?