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      01-31-2021, 11:26 AM   #2
Lieutenant General

Drives: 325xi 06 wagon MT
Join Date: Jan 2010
Location: Santa Cruz, Ca

iTrader: (0)

Don't use any tapping . Get a 6 channel amp and Technic harness.
Or get a Technic Harness a forget about the rear channels.

The output of the Head Unit in the Hi Fi system uses differential outputs
which means the there is a a plus and minus signal with no common ground.

You have to have and amp capable of taking this kind of signal which is essetialy
a reduced speaker out.

You could tap the Inputs to the amp but I don't know why you would do that since
you have to disconnect the existing speaker wires anyway for the amp to feed
those locations.

BMW stereo types
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