Check the listing for details. Xtenzi Remote Bass Knob Control for Select Soundstream Car Amplifiers. Color: Black, Condition: New. Listed at 24.99 USD. Description: The Xtenzi Brand Remote Control Knob XTBR31 Bass Boost Wired Variable Level Controller (secondary gain control), high quality product remote unit comes with 5Meter/16F long Flex remote connection wire/Cable and Bass Knob. Key Features: Xtenzi Brand Remote Amplifier Level Controller Optional bass remote XTRB31-91584Controls the bass/gain from the front seat or remote location from amplifiers, without having to reach for the amplifier.Allows you to adjust your Bass Level quickly and in the Most Ideal Location, easily mounts underneath a dash for an "out-of-sight' install or simple 1-wire connection gets you up and running in a flash.High Quality Product Remote Unite comes with 5-meter (196 inch) remote connection wire and bass knob.