Pa-066 Professional Audio 18 Inch Subwoofer Speaker Unit 100mm 8 Ohm 900w 97db (1pcs) - Speakers - AliExpress
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ROCKFORD FOSGATE Power 13" T2 Single 1-Ohm Subwoofer – Audio Design
Boss Audio Systems Cxx8 Chaos Exxtreme 8 Inch 600-watt 4 Ohm Single Voice Coil Compact Car Subwoofer Audio Speaker With Polypropylene Cone, Single : Target