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As particlewave mentioned the radio also supplies power to the amp. I encountered the same issue when I installed a replacement CDR220 in one of my cars. I had missed connecting the power supply wire to the amp from the radio. Everything worked, but no sound...just like you. Check the fuse on the amp and also check that all the wires from the radio are connected.
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1998 Boxster
1991 Carrera
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