Interesting. I’ve wanted to embark on the audio upgrade adventure, but life happened and I got sidetracked.
There’s a guy on the forum here that sells a harness that will let you connect any amp to power the underseat subs. Not sure if something like the match 7 will work on the e65 as I think the front and rear deck speakers are powered by the front radio unit. Not sure if the wiring in the back will cary the audio for the mids and tweeters as well.
My plan was to take the harness, connect that to a Helix P6 DSP and take the high level wiring from the front door and rear deck speakers and route it to the P6. Then run new wires to all the speakers from the P6 and run the separate RCA outputs for subs in the trunk on separate amps.
Then run filters in the P6 to run crossovers between the mids/highs, under seat subs and rear subs to make sure they don’t interfere with each other. And maybe run rear door speakers as well.
Obviously this would be way easier if this works.
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