?eresgreat Universal bass knob,bass knob for amp,Universal Bass Volume Knob with Extension Cable for Car Amplifier?Suitable for 4-pin bass knob?with 5M/16FT Cable is up for auction in Electronics. The current bid is $1.00, 93% below the $14.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.