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The Audi A4 platform with some radio systems had the radio power the two front speakers. The rear speakers were powered by an amplifier which is actually attached to the speaker with all of these wires that you see. I know in my 1999 Audi A4 car without the bose package this was the setup. The wires are for audio, power for the amp, radio turnon signal, etc. Some of the newer audi's I believe still use this type of a setup but I do not know exactly which ones.

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Q: Why does Audi a4 left rear speaker have 8 wires connected to it?
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