How to Bridge a Two-channel Amp
Car stereos offer installation and modification options. Most modifications can be accomplished on your own without having to pay a professional. One customizable option is the wiring and amplifier installation. The amplifier generates different amounts of power depending on which wire you use and how you connect the wires to the speakers. Bridging your amplifier to drive a subwoofer is a common way to achieve more power without spending extra money.
Instructions
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1
Determine the type of amp you want to bridge and the specifications for it. Bridging a two-channel amp increases the resistance you are putting on it. By running the amp at two ohms, you are increasing its workload. The amp needs to be stable at two ohms or it will not be possible to bridge.
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Locate the terminals on the amp where the speaker inputs are located. Because it is a two-channel amp, there will be two inputs--each with a positive and negative connection. You will have four inputs total.
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Connect the positive speaker wire to the positive terminal of the first channel. Connect the negative speaker wire to the negative terminal of the second channel. You are drawing the power from both channels and funneling it into one speaker, thereby bridging the speaker.
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4
Test the speaker. Turn it on and play music. Start with a low volume in case you have made a mistake. If the connections are strong and the sound is normal, you don't need to make any more changes. If it doesn't sound correct, check your wiring.
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References
- Photo Credit amplifier knobs image by Darko Draskovic from Fotolia.com
