I have been toying with the idea off fitting a sub in my car for a while now. I don't find the sound quality bad on the standard set up, just that it lacks some bass.
I was thinking off a slim sub and amp in the boot but have decided against it due to needing the space still.
I am now looking at a underseat subwoofer now. Won't be as bassey as one in the boot, but think it will still add more than it is now.
I've been looking at this:
https://www.caraudiocentre.co.uk/product_m-kenwoo
