LE-25 foam

[joetech]

I have some L-88s with LE-25 tweeters. The foam surround is turning to dust. I see on E-bay they are being sold for $5.00 or so each. However:
1. Is the foam really needed? It's been deteriorating slowly so I haven't noticed any change in the sound.
2. If it is needed couldn't I just as well use felt? or even find some open cell foam and make my own. Is it full of magic dust or something?

[joe]

That stuff is supposed to be microphone windscreen material " acoustically transparent" or is that L100 grill foam ?

IN ANY CASE ! I don't think it matters a hell of a lot. My L100's don't have the foam there and never did . I can't hear any untowards reflections , if there are any.

The le25 only does about 15k anyway and that not very forcefully .

I'd say put whatever on it that looks good to you.