If you are in the Greater Phila area Bill Legall of "Miller Sound" in Lansdale, Pa. is a real craftman and can do just about anything with speakers. You can check out an article about him at 6 moons.
You can buy a speaker refoam kit from Ebay for about 20 bucks and do it yourself. There is even a guy on Ebay who will refoam the woofers for you if you ship them to him. They are easy to remove.
Get on Ebay and do a search on "advent woofers" and check it out.
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