Alright here's what i'm thinking about doing. I am thinking about making a single subwoofer application in my car. I have been looking at some different brands. I'll be hooking the sub up to a Hifonics 1200watt amplifier. It'll be wired to only push 900 @ 2 ohms. I have been looking at company's such as: elemental designs, quantum audio, db drive, RE, and a couple more. I want the system to be fairly loud off of 900 watts. What company do you think has the best end of SPL? I also plan on building a custom box for it.