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In Reply to: RE: Difference between 3.7 and 3.7i's posted by josh358 on April 04, 2014 at 12:35:43
Outside of the glue wires and mylar there is the damping layer. You can use a lighter gauge membrane if you go for a stronger polyamide rather than a regular polyester. More expensive, but that is what BG did. The damping material would be something to look at. Maybe something that dries less stiff would make for lower final tension or for less mass if you can spray less of it and still get enough damping.
I tried pricing Neo magnets for the ribbon tweeters thinking that I could improve their efficiency but it was absurdly expensive. I think it was $300 just for the magnets. Then I had to have someone weld on stiffening strips on the tweeter frame so it won't buckle with the extra magnetic force. It all got very expensive very quickly.
Follow Ups:
Yeah, neo magnets are crazy, aren't they.
I recall reading a BG white paper in which they said they used Kapton on their smaller drivers because their small surface area required superior heat resistance.
Pic is of Kapton repeating unitKapton is a polyimide, BG used kaladex a cousin of PET, PEN Poly ethelene naphthalate (instead of terephthalate) good for high temp (180C continuous) film with 2.5X tensile strength of PET (of cola bottles fame) and great flex recovery. Makes for excellent capacitor film too. Also used for flexible printed circuit boards.
Edits: 04/04/14 04/04/14
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