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Rockville PBG18 18" Passive 2000 Watt 8 Ohm Pro Audio Subwoofer Sub/MDF Cabinet
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Focal 100 IWSUB8 In-Wall High Power Passive Bass-Reflex Subwoofer
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Sonance R12SUB Reference 12" Passive In-Wall Subwoofer (Each) Paintable White 93355 - Best Buy
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JBL JRX218S 18 inch Passive Subwoofer | Sweetwater
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KGEAR GS218 2x18-Inch Passive Subwoofer - Sound Productions
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RCF SUB-S12 Passive 12'' Bass Reflex Subwoofer - Sound Productions
3" Enclosed Passive Subwoofer
