I have a regular cab chevy colorado. I am looking for some bass behind the seat. I have a maximum mounting depth of 5". I have 925 watts rms @ 2ohms for power and will be building my own box. What I need is suggestions for the best setup for a sql system. Whether it be 4 8's, 2 10's, 2 12's they must be no more than 5 inches deep. My budget is $300 for the subwoofers themselves. If anyone can help me it would be greatly appreciated.