How to Bridge a 4 Channel Amp

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Bridging a four-channel car audio amplifier will effectively double your amp's output (watts) so that you can drive more power to your speakers or subwoofers. It's relatively easy to bridge a four-channel amp as long as you have a very basic knowledge of car audio wiring and how to connect an amp to your car's audio system. The most common application when bridging a four-channel amp is to connect the amp to a pair of 4-ohm subwoofers.

How to Bridge a 4 Channel Amp
(Michael Gann/Demand Media)

Things You'll Need

  • Four-channel amplifier
  • Speaker wiring
  • Philips screwdriver
  • Wire stripper
Step 1

Locate the speaker wire terminals on your amp. There will be four speaker wire terminals, or channels, which consist of both a positive and negative terminal with a screw-down clamping system to hold the speaker wire securely in place.

Michael Gann/Demand Media
Step 2

Run speaker wire from the positive terminal of channel one to the positive terminal of the first subwoofer. Use the wire stripper to strip about ½ inch of insulation from both ends of the wire, and clamp the speaker wire down securely in the amp's terminal using the screwdriver.

Michael Gann/Demand Media
Step 3

Run speaker wire from the negative terminal of channel two to the negative terminal of the first subwoofer. Again, strip ½ inch of insulation from both ends of the wire, and clamp the speaker wire down securely by tightening the terminals screw-down clamp.

Michael Gann/Demand Media
Step 4

Repeat steps 2 and 3 for channels three and four. Again, run speaker wire from the positive terminal of channel 3 to the positive terminal of subwoofer two. Finally, run speaker wire from the negative terminal of channel four to the negative terminal of subwoofer two.

Michael Gann/Demand Media

Tips & Warnings

  • Keep in mind that when bridging an amp, the resistance load (measured in ohms) is effectively cut in half. For example, if you are powering a 4-ohm subwoofer with a bridged amp, the resistance load would drop to 2 ohms. It's important to make sure that you're amp is capable of handling a 2-ohm load. Check your amp's manual for that information.
  • Never allow an amp to operate below its minimum resistance level (ohms), because it can damage the amp beyond repair due to overheating. Most amps are capable of running a 2-ohm load, but check your amp's manual to be sure.

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