REPLACEMENT FOAM SPEAKER SURROUNDS for Electro Voice Interface A, (α, αlpha)

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REPLACEMENT FOAM SPEAKER SURROUNDS for Electro Voice Interface A, (α, αlpha)

In the meantime there are a lot of suppliers of this foam parts arround the world - go to
Electro Voice Interface A | eBay
e. g.
http://www.simplyspeakers.com/ev-speaker-repair-foam-edge-kits.html

Follow questions rises up for me:
1) which supplier offer the best quality for those electro voice models, which are manufactured in Switzerland ?
2) are there even rubber versions for longer life time available without disadvantages in sound quality (i. e. for same parameter values both for Rms and Cms) ?
Thank you very much for advices.
 
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