usually all that can fit under the seats are mono class D amps. In my F150 supercrew i have a JL e1200 (200 watt mono class D amp) under the passenger seat, but in my accord i have a JL 1500 watt 3 channel amp pushing 3 JL 12" W3's. the 1500 watt amp is HUGE and the mono class D amp is very small.