Here's the subwoofer and amplifier in the TJ. The JL Audio G Series G4500 80W x 4 amplifier is mounted under the rear seat. Two channels power the sound bar's 6.5-inch speakers. The other two bridged channels power the subwoofer. The JK subwoofer enclosure fits easily into the TJ. Lance removed the upper mounting ear and ran a bolt through the back of the enclosure into the wheel well to take the place of the upper mount.