Photo 1 of Smileocean Universal Bass Knob for Car Amplifier 4-Pin Remote Subwoofer Volume Control with 13FT Extension Cable, Durable Copper Core, Easy Install, Compatible with Most Car Audio Systems

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Photo 1 of Smileocean Universal Bass Knob for Car Amplifier 4-Pin Remote Subwoofer Volume Control with 13FT Extension Cable, Durable Copper Core, Easy Install, Compatible with Most Car Audio Systems