How to Connect a Subwoofer Level Control Knob


Subwoofer level control knobs are handy devices to install in your car when you've got a subwoofer. These remote-mounted controls let you tailor the amount of bass you get out of your sub while you're sitting in the drivers seat, personalizing the output to match your taste. You can't add a sub level control to every system--you'll need a powered subwoofer or an amplifier that comes with an input for a subwoofer level control knob.

Things You'll Need

  • Drill
  • Screwdriver
  • Phillips screwdriver
  • Mount your subwoofer level control knob. Subwoofer level control knobs usually come with a simple mounting bracket that can be installed underneath the dashboard. Place the bracket in the position you'd like, mark the screw holes, and then drill small pilot holes with a drill and small bit (usually less than 1/8 inch). Place the knob in position and screw it in place using the screws supplied with the bracket.

  • Route the level control's cable to the location of your powered subwoofer or amplifier. It's best to route the cable forward underneath the dashboard, then drop it to the floor and put it under the carpet. You can roll the carpet back along the sides of your car's interior by removing the scuff plate at the edge of the doors. This needs to be unscrewed with a Phillips screwdriver in most cases.

  • Plug the end of the subwoofer level control knob's cable into the amplifer or subwoofer. The plug at the end of the cable usually looks very similar to an RJ-11 phone jack--the type you see at the end of a telephone line. The input on the amplifier or subwoofer will usually be labeled "REM" or "Remote level."

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  • "Car Stereo Cookbook;" Mark Rumerich; 2005
  • Photo Credit speaker image by CraterValley Photo from
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