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Not sure if the CDR220 is the same, but my car came with the amp and dash/door speakers. The original owner had the rear speakers installed and the wires when straight to the CDR.
Does the radio have a Fader? Could it be set to full forward so you are not hearing the rears?
My current setup, the Alpine uses the same RCA output to the amp. The amp still powers the front/door speakers. The rear speakers are direct to the Alpine. Works like the CDR220 did.
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