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Message: <blockquote data-quote="Vestax" data-source="post: 1604862" data-attributes="member: 556319">When you send a signal out to an external amp, it's considered a low voltage signal or output. After it's amplified, it's sending a high level output to the speakers or high voltage or current. By putting in an aftermarket headunit, which has an internal amplifier, you'll be sending high level signal into your stock amp, thus causing the sound to possibly get too loud or not play at all. I highly doubt you'll damage your aftermarket hu, but it might not even work at all with your new HU.Best thing to do is to eliminate the stock amp altogether. The amp will have 2 connectors on it, 1 input (from stock head unit) and 1 output to the speakers. To bypass, all you have to do is run speaker wires from that amp speaker outputs to the stock head unit.</blockquote>

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