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From diagrams I've seen and everything I've uncovered so far in my disassembly it is analog signal in copper wires. If it is of any use to anyone, I did find that the rear speakers receive a full spectrum signal. I played the three levels of test tones from Rockford Fosgate and got the three individual readings on my multimeter at the rear speaker connector. I can't say anything about the flatness of the signal but I didn't want to drag an O-scope home from work and play pink noise. I'm gonna hope it is a fairly unadultered signal. I plan to use this signal with a low pass for my door woofers. The plan is to fade the rear out to remove bass for podcasts or other spoken content.
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