Help, Resonance Feedback Speaker Door
 

My driver speaker creates a 10 second loud resonance and stops in low-gear engine states.
I have a full custom system: sub/mono/4chan/eq/speakers in my 2016 tlx. The system was flawless and perfect for one year. The front driver speaker stopped working. My audio guy fixed it saying a wire was corrosive. It appears that he added a small device to that speaker on the 4 channel. Now, I am having a strange issue.
There is some resonance issue on the front driver speaker. Similar to a guitar amp picking up feedback and become loud with resonance. The will happen for about 10 seconds. I can strongly link it to the engine activity. For example, when the car starts up and I put it in gear when idle; the state of the engine and its relation to whatever is in the door catches the resonance. It will get loud then stop. This may continue to occur in sort of low-gear 'coasting' engine states. I cannot identify what would do this. I don't really know inner workings of automobiles. My audio guy took off the door again to look. He couldn't identify it. It's a total mystery. I called my Acura dealer who'll do a diagnosis for 170. I wanted to reach out here for any ideas on what is going on, or things we can do to identify it. *I have an 8mb 20sec video, but don't know a media free hosting site.

I believe I've identified the issue and will post it in case someone else searches. So, originally a speaker cut out. The technician say a corrupt wire. He added a small device to the FL channel. It fixed, however, I began to have a feedback resonance issue. Usually when I would start the car and go into a low gear the whole door would shake with energy and power then click/stop. The speaker worked, but when I would cruise with no gas or similar engine workings it would catch the feedback. So, this is ridiculous, but the issue looks like it was the 4channel amp giving to much power. Now, I never changed the input/output from the equalizer so I did not think it would be a dialed setting, but I then I thought it sounds like its getting super powered and adjusted the input/output. I posted this after the technician evaluated the car. he had'd checked the amp config so i disregarded it.

The issue was the noise canceling in the rear interior. I disconnected it and it stopped immediately.