Car stereo receivers have RCA outputs with 2 volts. What does that mean? What happens when you buy one with higher or lower volts (the RCA outputs)? - Quora
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Amazon.com: MEIRIYFA Car Audio Stereo High to Low Level Converter,Auto Car RCA High to Low 2-Channel Line Output Adapter Adjustable with Power Amplifier Control Wire : Electronics
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How To INSTALL a Line Output Converter w/ Stock Radio & Speakers 4 Aftermarket SUB AMP Installation - YouTube
Do you need a line out converter between RCA cables from head unit to the car's speaker wires or can you cut and match the wires? - Quora
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