Car Radios (Dorchester) Ltd - This under seat subwoofer from ETON is a great add on to your system even if you don't have any space under your seat. Just like this
USB 6 – TS Auto Pte Ltd
Subwoofer Fenton Acoustics 12 30 cm 4 Ohm 750 Watt Made in USA California Car Hifi KFZ HD Bass - YouTube