[nguyenator]

Thanks for the ideas. I do not have the factory sub hooked up. i disconnected the factory sub. Instead of tieing into the end connector on the factory sub, i merely tied in closer down the line (i.e. along the rear door jam).

Seat is not the rattle.

My JL W3 is 4 ohm therefore running the MRP 650 at 4 ohms sends 400W. Should be perfect power.

I actually think now its the amp because i hooked up my old Pioneer 380W RMS and no popping. But i think i have ruled out the deck being my problem.