How to Bridge Two Subwoofers Together
Subwoofers are ideal audio components for recreating extremely low frequency sounds and generating deep bass output. Many home and car audio situations call for more than one subwoofer to increase the amount of bass produced; with just a few wiring modifications, it is possible to bridge two subwoofers together to work on the same feed.
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Instructions
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1
Connect the feed coming from the receiver to the first subwoofer. Simply extend the speaker wire coming from the amplifier (or amp) to the input terminals on the subwoofer. The subwoofer enclosure will likely have clip-style connectors that allow you to push the connector, insert the wire and release the connector to hold the wire in place. Secure both speaker wires in place before moving on to step 2.
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2
Insert another speaker wire into the first subwoofer. Strip the insulation from the end of a two- to three-foot long section of stereo wire. Press the clip-style connector on the subwoofer and insert the second wire in the same manner as the wire installed in Step 1. Be sure that the wire installed in Step 1 does not fall out of place while connecting the new span of wire.
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3
Plug the loose stereo wire into the second subwoofer. Working with the loose end of the stereo wire you connected to the first subwoofer in Step 2, strip the insulation to expose a small portion of copper wire. Connect this portion of wire to the second subwoofer using the same method used to connect the wire in Step 1. When the wire is connected, you have successfully bridged two subwoofers.
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4
Test the audio. When the bridge is complete, turn your stereo on to a low volume. Listen to each subwoofer to ensure it is creating an accurate reproduction of sound and that the sound is not garbled, polluted with static or weak. Gradually increase the volume, continuing to listen to the subwoofers to verify that they are working correctly. If one or both subwoofers are not working, verify that the stereo wire is securely plugged in and that the total impedence of the combined subwoofers does not exceed the output of your amplifier.
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Tips & Warnings
The more subwoofers you install, the more air they can move; this increase in air movement results in more bass sound and vibration. Use only quality subwoofers and amplifiers, as low quality components can cause undesirable effects.
Be careful not to exceed your amplifier's output power; typical amplifiers can support loads down to two ohms; if the combined impedence of your subwoofers is lower than two ohms, you may need a larger amplifier or different speakers.
