[Shamwow]

Trying to diagnose and correct an issue with my speakers. Wondering if anyone here knows what's up.

Car is a 2016 BMW 535d with the Harmon Kardon sound system.

A few weeks ago, I was parked listening to music in my car when suddenly the music cut out and there was a ton of static. Turned the car off, restarted, and I THINK the speakers were fine for the drive home. Thinking back, it may have just been the rear speakers, but I didn't notice at the time. Ignored it and hoped for the best. I was going on vacation for two weeks the next day.

Came back from vacation, drove the car and now the front speakers are not working (the sub is still working) I tested this by moving the music to the front and back. Back was fine, front you could only hear the bass. There are no Seatbelt chimes or audio from phone calls either, both things that play from the front speakers.

From what I can tell, there's three possibilities:

1. A wiring harness issue that led to the speakers cutting out for some reason. I'm not sure whether this is it because the rear speakers also cut out, but they're working now. The reason I think this is because the front subwoofer and rear speakers are still working.

2. The front speakers are all blown out. Super unlikely for that to happen to all of them at once, but I guess it's a possibility?

3. My amp is on the fritz and the rest of the speakers are probably gonna go soon too. Hoping this isn't it, but I have a feeling this is the one.

Anyone have any idea on how I could go about trouble shooting/fixing this? or if they might know where to look or who to ask. I'm at a loss here.