6.5" Subwoofer Dual 4 Ohm 500 Watts Max Car Audio Sub Audiopipe TXX-BDC4-6 - Walmart.com
GHXAMP 150MM 6 inch Pure Subwoofer Speaker Unit 4ohm 60W Deep Bass Speakers Home Theater Car Loudspeaker Rubber Edge 1pc - Price history & Review | AliExpress Seller - Ghxamp Auido Store | Alitools.io
Amazon.com: Audioengine S6 210W 6" Compact Powered Subwoofer with Powerful Bass in a Small Package - Surround Sound Subwoofer - Grey : Electronics
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JL Audio 6W3v3-4 W3v3 Series 6.5" 4-ohm subwoofer at Crutchfield