Hmmm I wonder if the driver from the sub 15 is the same size and if so if it would work in the 25?I personally could never get rid of the rattle. I used PBK multiple times but could never get rid of the rattle. I sold them and got Seaton speakers for subs. As hard as I push those subs I have never had the same rattle that I had on the paradigm speakers. The newer sub 15, as far as I know does not have that rattle but it is a newer speaker. They do not look as nice as the sub 25 but if you could trade them in for the sub 15 it would be a much better speaker.