How to Bridge a 4 Channel Amp
Adding a bridge to a four-channel automobile audio amplifier can practically double the output (wattage) of your amplifier, allowing you to drive more power to your speakers or subwoofers than before.
Bridge-building a four-channel amplifier is a reasonably simple process if you have a very basic understanding of automotive audio wiring and how to connect an amplifier to your vehicle’s audio system.
A four-channel amplifier is most commonly used to connect a pair of 4-ohm subwoofers, which is the most popular application for bridged amplifiers.
Find the speaker wire terminals on your amplifier and connect them.
It is anticipated that there will be four speaker wire terminals, or channels, each of which will include both a positive and negative termination, as well as a screw-down clamping system to retain the speaker wire in place.
Connect a speaker wire from the positive terminal of channel one to the positive terminal of the first subwoofer, starting at the positive terminal of channel one.
Using the wire stripper, remove approximately 12 inches of insulation from both ends of the wire. Then, using the screwdriver, secure the speaker wire in the amplifier’s terminal by clamping it down firmly.
Connect the speaker wire from the negative terminal of channel two to the negative terminal of the first subwoofer, starting at the negative terminal of channel two.
Remove 12 inches of insulation from both ends of the wire once again, then clamp the speaker wire down securely by tightening the terminals screw-down clamp on the speaker wire.
Steps 2 and 3 should be repeated for channels three and four.
Continue to run speaker wire from the positive terminal of channel 3 to the positive terminal of subwoofer two until the wire is completely exhausted.
In the end, connect a speaker wire from the negative terminal of channel four to the negative terminal of subwoofer two using the speaker wire connector.