Boss Audio MR101 10" 600-Watt Single Voice Coil Marine Subwoofer
Amazon.com: 6.5” Slim Marine Subwoofer - 150W 4 Ohm Waterproof Car Component Speaker System, Low Profile PP Cone w/Rubber Edge, 20 Oz Magnet 1" Voice Coil, for Custom Audio Boat Truck Mobile
Amazon.com: DS18 NXL10SUB Outdoor Marine Audio Subwoofer with RGB - 600 Watt MAX 300 Watt RMS 10-Inch White Waterproof Bass Loud Speaker For ATV/UTV Stereo Sound System, Under Helm or Box Case