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.
B&W and deteriorating Kevlar drivers
I have a pair of B&W 802N's purchased new when they first were introduced. Over time I had noticed a slight "card board" sound in the upper midrange that seem to grow over time. Just replaced the Kevlar midrange drivers and the distortion left........they need some break in time, but I think I solved the problem (not the cross overs). They certainly changed color over the years from yellow to almost orange. I would recommend the replacement of the midrange drivers if you have the original 800 series.
Anyone else have this experience?
Anyone else have this experience?