im tryin to decide what subs to get for my car, 4 6.5 inch kicker subs that would go in the cabin of the car (a coup) using 2 kenwood kac-8104d amp' but only puttin 600 watts rms to them, or 2 10 inch kenwood's using a kenwood kac-9104d amp and puttin the same rms (600 watts) to them in the...