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QSC KS118 direct radiating, powerful, 18-inch active subwoofer
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Amazon.com: MB Quart RW-110A 800W Reference Series 10" Slim Low Profile Compact Under-Seat 4-Ohm Active Powered Subwoofer Enclosure with Built in Amplifier for Car RV ATV : Everything Else
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STEALTH AS-8 | Wet Sounds 8" Active Marine Sub Enclosure - Wet Sounds
Pioneer Sealed 12 in. 1300-Watt Active Subwoofer with Built-in Amp TS-WX1210A - The Home Depot