L-8028 Dual 18 inch High Power Pro Subwoofer Box - Buy 18 inch subwoofer, high power subwoofer, s8028 subwoofer speaker Product on Sanway Professional Audio Equipment Co., Ltd.
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DFS-9218 SUB Dual 18” Bass Passive/Non-Powered Subwoofer 3200 Watts | Better Music Builder
TSG Dual BandPass 1218 DUAL 18" Woofer 106 DB at 1 watt LOW SHIPPING!! – SpeakersAndAmps.com