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In Reply to: RE: Foil vs Wire: What difference does it make? posted by Davey on December 27, 2022 at 14:59:54
There are many more differences between the older generation (3.6) and newer generation (3.7) than just a switch from wire to to flat foil.
The original question asked, though, was simply "Foil vs Wire: What difference does it make? " not "how are the newer magneplanar speakers different.
One thing that I had not considered in my original reply was the change in diaphragm stiffness that the foil / glue / mylar "sandwich" would impart to the speaker. Yes that would change frequency response, all other things being equal. But the "other things" were also changed so I assume some one of those changes compensates for this somewhat stiffer diaphragm. ( Really I'd like to measure the stiffness of an old diaphragm vs a new one...yes there is more glue surface area, but wire is stiffer than foil....)
Science doesn't care what you believe.
Follow Ups:
Round vs. flat wire in a planar has been investigated by Joppe Peelen. As the diaphragm gets stiffer with the foil it also changes the frequency response. Slightly better for higher frequencies but not for lower, the Mylar cannot stretch the same way.
Yep, I'd expect the compliance would go down, meaning resonant frequencies would go up given the same tension and geometry. They'd have to be tuned differently.
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