Subwoofer Install Guide

Subwoofer Installation Subwoofer Install Guide
Difficulty: Moderate
Most car manufacturers do not include subwoofers with the factory stereo system. The process of installing them can be complicated.


For a 2 Channel Amplifier Please Disregard Step 6A.

For a 4 Channel Amplifier Please Include Step 6A.

  • STEP 1: Strip out the carpeting from the trunk and clean the metal surface.
  • STEP 2: Take sound-deadening material (Dynamat or Accumat), and heat it with a heat gun or hair dryer or just leave it out in the sun to heat.
  • STEP 3: Spray glue on the metal surface of the trunk, peel the back off the Dynamat or Accumat and apply the material to the metal surface. Use the heat gun or hair dryer to continue heating as you apply.
  • STEP 4: Using a roller, press the material onto the metal so that it bonds with the surface.
  • STEP 5: Replace the carpeting.
  • STEP 6A: Reconfigure the speaker hookups on your four-channel amplifier so that the front and rear speakers already in the system are using the two front channels of the amplifier. The front channels of the amplifier should have a high-pass crossover to work these speakers.
  • STEP 6B: Bridge the rear channels of the amplifier into mono so that the amplifier will supply twice the power. The instructions that came with the amplifier will show you how to do this.
  • STEP 7: Wire the subwoofers into the amplifier using the instruction manual from the Amplifier and the Subwoofers. The output channel/channels of the amplifier you select should have a low-pass crossover.
  • STEP 8: Test to see what the best crossover point is for the subwoofers.
  • STEP 9: Use metal L brackets to brace the enclosure. Secure the box to the floor, a wall or the rear deck. Be sure to place silicone around the bracket so that air will not leak from the box.

Tips & Warnings

  • Play around with the positioning of the subwoofer box in the trunk to get the sound you want. You may find it best to point the box so that the subwoofers are aimed toward the rear or toward the interior of the vehicle. When pointing toward the rear, the sound wave has a longer distance to travel, and you get more bass as a result.
  • To test for the best crossover point for the subwoofers, set the low-pass crossover of the amplifier at 100 Hz and play something on your system. Watch the movement of the subwoofers. The lower the crossover-point frequency, the less movement on the subwoofers. Watch to see whether the subwoofers are moving too much and listen to the music to determine whether there is distortion. Most systems run at 85 or 80 Hz.
  • Before you place the L brackets, check to see what is on the other side of the surface you will be screwing into. You don't want to cut a gas line or wire.
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