Let us know what you find out, I already had my first service and have been avoiding going in just for the speakers.
The front soundstage is good for the most part. They either used cheap speakers in the rear doors or the crossover is set wrong.
I’m thinking about replacing the rear doors with some after market rears. Just didn’t want to waste money if it’s a crossover issue..
My Rs is a 2020 just hitting 7500 miles and I had my first service before I noticed it.
Also have a rattle coming from the driver side door that’s getting worse, but I don’t have much faith in a dealer fixing rattles from playing too much bass..