RX8Club.com - Bose speaker feedback/whine (Isolated to single speaker)

Good morning,
Lately I have been having a problem with my front passenger side 9" Bose door speaker giving me some real nasty feedback, similar to the kind of dilemma that could be resolved with a ground loop isolator. The thing is, my system is completely stock so there should be no reason for this to be happening. The issue is isolated to only that one speaker, and im trying to find the root cause of the issue.

I have searched for answers to this issue, and in the threads I found and read individuals were usually either dealing with an aftermarket head unit on a vehicle with a Bose system, or their threads were started with no clear resolution and the OP just disappeared. I am hopeful that someone could shed some light on where I need to look. I'd like to start with clarification on a few things..

-Where does the door speaker negative ground to? I follow the wiring into the door wire loom but i cant tell where inside the cabin it ends up grounding at.

-Where does the factory head unit ground to? Again its difficult to tell with a bunch of plastic dash components in the way. I don't believe this is where I will find the problem as I feel like it would affect several speakers, but I still want to check for the sake of eliminating that as a possibility

-Is there a "noise filter" for the factory bose system? And if so where is it at? Im trying to trace back the wiring to look for anything that would cause this to happen. The only hardware that I am aware of is the main amp in the trunk (I don't think it would be that? But I'm no expert so who knows), the head unit, the door amp, and the speaker itself (which I've already had to open the door up twice now to replace it from the feedback causing the speaker to blow)

What really has be baffled is the fact that it happens intermittently and randomly. That's all I've got right now, thanks in advance for any and all insight provided