Well, I finally finished my subwoofer box last weekend. I made a dual vented box using Infinity Kappa Perfect 12.1d (dual voice coil) subs and a JBL 600.1 amplifier. 300 watts to each sub. This thing is powerful. It sounds pretty darn good too. When I was testing it out at first, my mom came out after a minute and said that she could here it inside. She also heard things rattling in the garage. Mind you I was in the driveway with all windows up, all doors and the trunk closed.

If anyone else is interested in car audio I could recommend Infinity speakers with JBL amplifiers. I found them at Sound Domain for big discounts to so I got quite a bargain. There better speakers and amps available, but you have start paying a bit more to notice a difference. I would say it's something like Outlaw equipment in that I got pretty darn good equipment for a much lower price than would be expected