It's easy to find a speaker to fit, buts a bit more difficult to find a speaker that will sound the same or better in the same box. Is there any chance you could find out the t/s parameters of the existing driver? If so then you could probably find something close at parts-express.com
Thanks for you reply, I was looking at Part Express, but didn't know which sub to get as replacement. I posted specs of the old driver in post #2. I'm not too picky on sound quality, just something to add a little oommphhs to movies and music. My sub is in a very small room, so don't need a bunch of power neither. I believe the old sub is 8 Ohms. Do I need to look for replacement of same Ohm?