I have a blue wire coming from the head unit of the car stereo Mark subwoofer RCA jack, where does it connect to or what is it for?
Md Ariful Islam
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Dr. Md Rushad Rahman
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Most often the blue wire from the head unit (stereo) is to connect to the REM (remote) line on an amp. It turns the amp on/off with the car. But to be safe, look into your stereo manufacturer's details.
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