The USB 10 is an active flat box subwoofer for mounting under seat and other suitable positions. ETON RES 10 A Car Audio 10 Active Subwoofer Enclosure 300W RMS. Phoenix Gold Z Series Z8150 8 Active Amplified Car Under Seat Slim Subwoofer.
VW Ttansporter T5 2006 – 2009 Custom Upgrade Kit – Focal iBUS2.1 – 20cm 8″ Active Amplified Under Seat Car Subwoofer 2.1 Bass System with a Pair of Focal 165AS 6.5″ 2 Way Car Door Component Speakers & Fitting Kit.