SeaKing Stores › 15in car subwoofer - 4ohm DVC - P3D4-15 15in car subwoofer - 4ohm DVC - P3D4-15 £260.00 15in car subwoofer - 4ohm DVC - P3D4-15. 600W RMS. Standalone driver, sold individually. Car-audio product; not marine-rated. Add To Cart Added! 15in car subwoofer - 4ohm DVC - P3D4-15. 600W RMS. Standalone driver, sold individually. Car-audio product; not marine-rated.