Tbh is way above my knowledge if you go none BMW aftermarket stuff
I have an E92 with basic system ands it's awful
Before I got it was looking at getting a new E92 had heard the surround system in an M1 in the dealership and was top notch
But decided to get a second hand one, you can get an alpine upgrade with L7 subs under the seats which gives you an amp and better speakers
But ain't to sure what you can do with the new models
Try the audio section I think it's on the USA bit of the site
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