Making door speakers actually sound decent.

[BR3W CITY]

So since the p.o cut the doors on my 66, for 6x9's I'm stuck with some holes in my doors. Since I don't want kick panel speakers (I need the ankle room), I'm going to try and make the doors sound decent.

I'm adding deadening mat to the inside panel, and I'll be making a mdf ring for the speaker to mount to, instead of screwing into the sheetmetal and vibrating like hell. What else can i do? What about the polyfill stuff for sub boxes? Would there be an advantage to adding this to the doors?

With the old door speakers, screwed into the door and the crappy 3-1/2 speaker the po jammed in the dash, you can barely hear the stereo under many conditions.

Thoughts?