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GHXAMP 5 inch Speaker 5.25 inch Subwoofer Speaker 134MM Woofer Strong Bass Concave Bowl 4ohm 40W 56Hz-4.5KHz 1PCS - AliExpress
Amazon.com: RECOIL REM525 Echo Series 5.25-Inch Car Audio Component Speaker System : Electronics
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NEW 5.25" inch 5 1/4" Mini SubWoofer Ultra High Bass Driver Speaker 8 Ohm 200W | eBay