SeaKing Stores › 12in shallow car subwoofer - 1ohm SVC - T1S1-12 12in shallow car subwoofer - 1ohm SVC - T1S1-12 £510.00 12in shallow car subwoofer - 1ohm SVC - T1S1-12. 600W RMS. Standalone driver, sold individually. Car-audio product; not marine-rated. Add To Cart Added! 12in shallow car subwoofer - 1ohm SVC - T1S1-12. 600W RMS. Standalone driver, sold individually. Car-audio product; not marine-rated.