Quote:
Originally Posted by pcr
If I understand you correctly, the Connects2 is powered (and earthed) from the cigarette lighter, whereas the HU is powered from elsewhere. Potentially you have an earth-loop, ie. the source and the Amp are earthed at different points, a good candidate for causing this type of problem.
Also, maybe the power at the cigarette lighter has too much electrical noise, in which case a decoupling capacitor might be the answer.
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Interesting. Do you have a link to a decoupling capacitator product?