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18" Custom Hand Built Subwoofer 5000rms (Team 18) - EM Audio Subwoofers
Sundown Audio X-18 V.2 D4 18" 1500w RMS Dual 4 Ohm Subwoofer Speaker Basket for sale online | eBay
Amazon.com: 5 CORE 18" Raw 850W Peak Sub Woofer Cast Steel Basket Driver for Pro Audio PA DJ Cabinets Subwoofer with High Handling Power 500W RMS Extremely Clear and Loud Replacement Speaker
TXX-BDC4-18 Subwoofer Quad Stack
Rogue Car Audio Vandal 18 | 1200 WATT 18 inch Subwoofer - D2 - Down4Sound Shop