I also have some Ascoustats, and had an e-mail conversation with someone a few weeks back where he had locally gotten some Spandex and used that as replacement grille cloth. Said it worked great. The lower density of Spandex over grille cloth didn't mask the sound as much. One problem is that you have to remove the existing grille cloth so that the local seamstress can use it as a pattern for the replacement Spandex.
