Some background info..... Newly install system in a 2018 M3 with H/K system Had a local shop do the remove and replace/sans the headunit (needed it to be Plug and Play for a lease) Audison Bit-DMI Audison F8.9 AMP/DSP 3 sets of Focal BMW IS-100 CH 1-2Front Dr, CH 3-4Rear Dr CH 5-6 Rear Deck...

Earlier this year I had an audio system installed by a local shop, thinking that this was a great save money and get a better system than the one the dealer provides. My mistake! The install job was a joke, it's gotten to the point that I've taken over trying to fix it. I'd rather the shop...

Okay, I don't know the first thing about car audio but I've been lurking here and searching the forums to get a clue. I'm grateful there's a dumb question forum. I don't mind wrenching, and I'm not clueless about electronics in general. I'm planning a system for my '98 Tacoma extended cab...