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Amazon.com: Harmony Audio HA-ML181 Monolith 18" Car Stereo Competition SPL Sub 3500W Dual 1 Ohm Subwoofer : Electronics
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RE Audio SX18-D4 18" Dual 4 Ohm SX Series Car Stereo Sub Subwoofer SXX18-D4 (SX18D4 / SXX18D4) - REA-SX18-D4
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