Hello, I have a mustang 2016 coupe got it used about 5 months ago good condition. When I got it the speakers sounded terrible bass was very low and making a rattling sound. I decided to buy new speakers while I was at the shop getting a few other things done they put the new speakers and it still sounded like crap low bass and rattling.
They told me it was because of the hole in the door (the window defrost)) that’s why the speakers were sounding like that. I’ve been trying to do some...

Speaker problems because of window defrost??