I must not know how to search stuff on here because im having no luck lol. I know how to remove the seats and the sub/amp but that's where it stops. Any help would be appreciated.Yes, there are a few threads discussing how to replace the sub, disable the microphones (which otherwise kill the response), etc. I forget where they are exactly, but you should be able to find it. Let me know if you can't and I can try to dig them up.
thanks for finding thatI agree, the new search seems to be awful... doesn't work with quoted terms, etc.
Anyway, I saved off a PDF of the one I had found quite some time ago, because I thought it was well written and detailed. I found it on here via specific terms from the PDF, which led me to the thread which is here now: https://www.cadillacforums.com/threads/dyi-sub-amp.579498/
I suggest printing it (I did PDF because I lose paper, haha)... but you get the idea. That should give you a good head start.