How to Hook One Subwoofer Into a Two-Channel Amp

Written by nichole liandi
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How to Hook One Subwoofer Into a Two-Channel Amp
Wire a sub to a two-channel amp. (speaker image by Byron Moore from

A common method of powering a single car audio subwoofer is to take the output of a two-channel car amplifier and use it to power the sub. The combining of the amp's two channels is known as "bridging," and virtually all two-channel amps are capable of being operated in this fashion. There's no special expertise involved in bridging the amp's output to run a single subwoofer.

Skill level:
Moderately Easy

Things you need

  • Speaker wire
  • Wire cutters/strippers
  • Screwdriver

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  1. 1

    Cut a length of speaker wire long enough to run from the speaker output terminals of the amplifier to the terminals of the subwoofer or sub box. Gently pull apart both ends of the speaker wire until you separate the leads for 1 to 2 inches.

  2. 2

    Remove 1/2 to 3/4 of an inch of insulation from the ends of each piece of speaker wire with your wire strippers.

  3. 3

    Note which lead of the speaker wire is marked as the positive lead. In most cases there will be a series of "+" running down the outside of the lead's jacket. Some speaker wire is colour-coded--choose one colour to be the positive lead if this is the case.

  4. 4

    Loosen the speaker terminals of the amplifier that are marked as "bridged output" with a screwdriver. The exact wording may vary, but there will be two terminals designated for bridged output--one positive and one negative. If in doubt, consult the manual.

  5. 5

    Slide the bare end of the positive speaker lead under the positive bridged terminal and tighten with your screwdriver. Slide the negative lead under the negative terminal and tighten.

  6. 6

    Loosen the terminals on your subwoofer--either unscrew them with your fingers until a hole appears in the post, or push down on the terminal to reveal the opening. Slide the bare end of the positive wire into the positive post and release or tighten. Do the same with the negative lead and negative post.

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