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Rear speaker upgrade

Electrical and Electronic

Vehicle Information: Year: 2003; Engine (type, size, modifications): 3.2; Total Mileage: 15K; Transmission: Manual;

My Boxster S is equipted with the 490 hi fi stereo option, CDR23 radio and Becker amp and CD changer in the front trunk. I purchased the OEM rear speaker kit from a club member, and installed it, plugging the brown cable plug into the obvious jack on the back of the head unit. Nothing comes out of the back speakers. Troubleshooting shows no speaker output on the head unit. I was then told that I had to plug the rear speaker cable into the amp. No obvious place to plug it, though there are unused pins on the amp''s wire harness. What am I doing wrong? Where do I plug in the rear speakers? Am I missing something obvious?

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