B&W and deteriorating Kevlar drivers

Just curious where you live. Could it be the climate and the humidity (or lack thereof) that is a contributing factor in this? Just wondering.

Angst0,
Are your speakers exposed to sunlight from a window or skylight? It could be that the Kevlar broke down 'chemically' due to exposure...just a WAG.
Kevlar does have a 'honk' as some critics have described it.
It was used for it's great strength to weight ratio...personally, I do hear the coloration somewhat.
In the THIEL CS5, Jim's best work (I haven't spent time with the 3.7 which gets raves) he used a Kevlar midrange, but I didn't hear the same coloration. Of course he was using it across wide bandwidth, at 6db per octave it would have seemed to show any weakness in the frequency extremes, EXCEPT for the fact that there were so many drivers, 1 Tweet, 1 Dome, 1Kevlar, and then three paper woofs,(or composite, damn I'm so old I forget things like this too easily). They may have been a plastic coated, paper, OR maybe a poly.

Again, didn't hear that 'honk'.

BTW, the sunlight thing...is that a possibility?

Larry

Thanks for the comment. The speakers are in a sunny room, but not in direct sunlight. You can see pictures of the room and system in virtual systems. http://forum.audiogon.com/cgi-bin/fr.pl?vevol&1262106902&view Humidity not unusual....Phila area.

I have experienced this. The aramid fibers (kevlar) in the main drivers do appear to "age" over time. They change color and I also noticed the "papery" coloration in the upper mid-range gradually become more pronounced over an 11 year period.

Aramid fibers such as kevlar degrade in ultraviolet light, so sunlight may be the culprit.