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To be honest I was a bit confused myself to see a connector with the lineouts being plugged in, but my guess was that it was needed for the ignition can data signal.
But seeing the extra added switched 12V cable and that the speaker cables being directly connected to the cdr-23 makes one believe that an earlier owner has done some mods and restored it back before selling the car.
In short: I'm not using factory amp, and the speakers are (and will be) directly plugged into HU.
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