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Old 03-05-2018, 07:01 PM   #4
kramard
 
Drives: 2012 BMW 135i
Join Date: Nov 2016
Location: MD
Posts: 396
It’s all pretty rough BUT if you replace door speakers, splice the rear speaker inputs and run a dedicated amp to power a 10” sub its plaitable (that’s what I did.) The signal out of the head unit isn’t great but I think there are some devices that can clean it up? Iirc I’m running all 4 speakers off of two channels and running a sub off the other on a 4 channel amp. Using the rear speakers as input costs you the Bluetooth phone though.

I can take pics of my setup when I get back from my work trip. I can check iCloud if anything is there.
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