I figured out what the feedback was from. It was from my LED backup lights. The bulbs would cause an error message for me to check the backup lights. Well I replaced the backup light bulbs today with some normal ones and what do you know, the feedback from the sub was gone! I am glad that I figured that one out. I would not have been able to figure it out except that BSW told me to recheck the grounding of the amp to the reverse circuit. That is what gave me the idea.