I bought this head here http://www.talkbass.com/forum/showthread.php?t=163532 sounds great on my friends 2X10 cab. Real loud. So I figured I'd build my own becuase he needed his back. Bought two Peavy scorpion 10" bass drivers. They are both rated for 200 watts RMS at 8 ohms. I wired them in parallel So should be capable of handleing 400 watts at 4 ohms. Problem is it sure doesn't sound like it can handle 400 watts. I don't have a decible meter or anything but as soon as I turn it up loud enought o play with a drum kit it starts distorting really back. I figure its gotta be the cab cause A) the head sounded great on a different cab B) I made the cab and although I've made a ton of sub boxes before I'm no speaker building genius or anything So i've probably ****ed somehting up. So can anyone help me out as far as what kinda of problems to look for? I just used standard speaker guage is that good enough? I'm really hoping maybe thats it maybe i need some thicker wire or somethng simple but if I made the port holes or the cab too big that might be a huge pain in the ass. Also what kind of info do I need to give you to help me out? I can get exact dimensions of the cab and the exact specs of the speakers but if people could give me the 'easy' things to look into before I have to start measuring volumetric efficiency and stuff that would be great. I'm really hoping I just need better speaker wire or something like that.