so basically Im trying to build a rig. Got a speaker box (no big name company, Alumi-Pro) with a 800 watt busted speaker cone. Took the cone out and put a new 400 watt/4ohm Carvin 15 inch woofer in it. Got a nice Craigslist steal with a Carvin BX500 head, rated of course at 500 watts. Hooked...