Audi A6 Subwoofer Upgrade on b&o system

Hello Folks,

I have a Audi A7 (c8) black edition 45tfsi with the tech pack, comfort & sound pack.

I’ve recently been trying to do a subwoofer upgrade on the bang & olufson system.

I’ve managed to power the amp but I am struggling getting the high to low connection from the original subwoofer in the rear of the car.

There are 4 wires which go into the sub but can not determine which wire is which.

To add to my troubles, now I have reconnected the wire to the original subwoofer & that is not working now either.

Rest of the speakers are working fine.


Thanks!



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I guess it was just some sort of a protection for the amp as the next day it worked fine and i was able to tap signal for my high to low converter.

Sub is plugged in now and all working good




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