This has been driving me nuts for a few years. i'm testing here within 100 Hz test tone. I even bought new speakers thinking I blew one. These are the new speakers but same problem as the stock ones. Notice when I pinched the door in a certain spot, the resonance changes. Any relatively affordable fixes or something like this? Thanks a lot for your help and expertise.
I'd really appreciate if someone here would be able to help me with this problem.
You can see what I'm dealing with in the video. I can't seem to figure out how to attach these JBL speakers. I bought them from Crutchfield and they provided adapters to help fit the door. The holes in the JBL seem to line up with these 4 holes on the bracket.
The provided screws were too long and reached the surface of the car door. I bought similar size screws in a shorter length but they just spin. There were clips provided with the original hardware for the adapter but they don't seem to fit these holes. What am I missing here? Thanks so much in advance for any help.