This is a new post similar to an older post, but I didn’t get any traction (pun fully intended) on responses. Here’s a link to the original post:
So basically, I’m encountering a similar problem, except my aftermarket stereo has been installed for years...
I’ve been looking around for a better sound system for my new Elise. I had the idea of setting my Bose Resolve speaker on that cubby behind by seat. It actually sounds really good! You can invert them cone so that it sits deeper in the area if you want to. Anyway just thought I’d mention it.