Larry, they are the doped cloth surrounds on the woofers.
Had some time today to figure this out.
I hope I save someone a little time in the future by continuing this thread a little before they tear into their XP-10's.
After removing the backs I can see the grill cloth wrapped around the front baffle, glued, then cleats screwed on top of all four sides.
http://www.flickr.com/photos/81961710@N02/8045971158/
So you can't just remove and inspect, this is a bummer and turning out to be some work. :sigh:
Now if you notice in this next picture, Fisher placed the woofer nuts on the front of the baffle so if the nuts falls out there is no way to hold them in place to remount the woofer. The first screw I removed the nut fell loose, so I'm not at this time removing the others.:tears: This was not one of Fishers better ideas :nono:
http://www.flickr.com/photos/81961710@N02/8045970624/
I'm also thinking about adding some cabinet bracing and adding a new 4" base to the bottom to rise them up a little.
Fisher must have have been really proud of these by going to the trouble of stamping patent numbers on the bottom...
http://www.flickr.com/photos/81961710@N02/8045969982/
I want to replace the tweeters before they go dead but haven't decided if I should save the orginal mid/tweeter board and cut a new one or just butcher the orginal to make a new tweeter fit.
Pictures of orginal board, not much to it.
http://www.flickr.com/photos/81961710@N02/8045969354/
http://www.flickr.com/photos/81961710@N02/8045968864/
Since I'm tearing into these again decided to go ahead and order Solen Capacitors for the Xovers.
The Dayton tweeters I was thinking of as a replacement are 4 ohms the orginal fried egg tweeters read at 9.3 ohms so the total resistance would drop to 5 ohms.
Not sure if the Sony HT unit I'm using right now will last very long at this load...
If anyone reading all this happens to know if I can drop in a 4 ohm tweeter with out screwing up the orginal crossover please let me know.