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I have just upgraded the base audio in my G30 to the Focal IS BMW 100 L, I SUB BMW 4 and IC BMW 100 plus the impulse 4.320 amp. It’s a massive improvement over the base audio system which was a huge disappointment. I used the IMP 2.1 wiring harness and located the amp in the trunk. Everything was completely plug and play. It took me a while to realise that the speakers in the front doors are effectively wired from the subwoofers under the front seats - so cables run from the amp to the subs and plug in using the factory connectors. Running the wiring harness was the hardest part of the install.
I’m now interest to see if anyone has any recommendations about coding that would better for this setup compared to the base audio.
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