Just a general question here. Say i hot an amp that can supply 350 watts at 8 ohms program. I hook up an 8 ohm speaker that's rated for 350 watts, that's a pretty good match (although more amp headroom would be better). Now say an amp can supply 500W program at 4 ohms and I hook up two 8 ohm speakers (say 600W program) for a 4 ohm load. 500W is pretty close to the 600W speaker rating, so maybe not too bad if I don't push it. But wait, there's two speakers, so each much be drawing 250W max. So grossly underpowered. Maybe Ok if not pushed into clipping but certainly underutilized. Is my understanding correct? I could pick up some Yamaha SW118v subs (maybe) for very cheap. Passive subs without crossovers and only rated at 600W, so worth it IMO if I can trade some inexpensive stuff I was going to sell. The problem is how to power them without buying a crossover. I have a QSC amp that will put out 2x450W or it will put out 1x500W at 4ohms and has a built in crossover that sends the lows to only one channel. So I think I can get 500W sub 100hz with both subs in series. I know I'm better off with say one 720W program active 15" sub with built in crossover and DSP (which I just picked up). This is just fun to think about.