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The DAC in the head unit is crap - the only option is to feed the highest quality analog signal possible into Aux-In. Using USB in means the car is converting to analog.
The other choice would be to go direct into aftermarket amp via USB but again that will not charge your phone so you still need an adapter. You don't want the car or your phone handling the digital to analog conversion neither has a quality processor.
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2022 Macan S
2016 F31 328i xDrive Sport Wagon
2006 E46 330ci ZHP Convertible
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