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Amazon.com: Pyle PLMRW8 8-Inch Outdoor Marine Audio Subwoofer - 400 Watt Single White Waterproof Bass Loud Speaker For Marine Stereo Sound System, Under Helm or Box Case Mount in Small Boat, Water
Amazon.com: Kicker Marine Stereo System Package - Two Pairs of OEM 6.5" Kicker LED Speakers, a KM 10" Subwoofer, and a KXM4004 Amp : Electronics