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Amazon.com: DS18 PRO-BX18N.2 Car Subwoofer Audio Speaker - 18" in Neodymium Magnet, 6" Voice Coil, 2 Ohm Impedance, 2500W Rms Power, 5000W Max Power - Reinforced Paper Cone for Outstanding Performance : Electronics
Amazon.com: JBL Professional PRX418S Compact Passive Subwoofer, 18-Inch, Black : Electronics
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Amazon.com: QSC KS118 Active 18" Subwoofer : Musical Instruments
Amazon.com: Rockville RVP18W4 1200 Watt 18" Raw Replacement DJ PA Subwoofer 4 Ohm Sub Woofer : Musical Instruments
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