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Coated woofer - why?

An old (20+ years) speaker with multiple previous owners has a coated woofer - why would this mod be made?  What are the implications for SQ?  Speaker is a LS35A type with original KEF B110 woofer.  
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Showing 2 responses by georgehifi

georgehifi's avatar
georgehifi
10,312 posts
 
Btw this was the way Sonus Faber did the same FS (resonant frequency) lowering and stiffening of their bass cones on their stuningly magical sounding Extremas.

https://images.app.goo.gl/w9frGfkLN9dfrJoJ6

Cheers George
georgehifi's avatar
georgehifi
10,312 posts
 
Back in the days when i made my own speakers I used to do it to add mass to lower the FS (free air resonance) of the driver and to stiffen the cone.
The way it was done to have a nice ripple effect is to face the driver upwards paint it with thick coat of dust cap glue/Aquadhere (a clear drying wood glue) give it a 25hz sine wave single so it’s wobbling nicely, this gives the glue the ripple look while it sets, 20mins or so. 

Cheers George
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