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18 inch subwoofer speaker S118H-II
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Dual 18 inch subwoofer speaker S218B-III
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18 inch subwoofer speaker S18B-III
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Active dual 18 inch subwoofer R218P
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18 inch subwoofer speaker PO-SUBP-III
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18 inch subwoofer speaker PO-SUBK
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21 inch subwoofer speaker LS21
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Powered 18 inch subwoofer LC18P-III
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Dual 18 inch subwoofer speaker S28
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Active 12 inch subwoofer speaker S12P