They have a history of being fairly fragile. But are you sure the fuses are still good. Just swap them with whatever you can find for a test.
The tweeters are the original Scanspeak D2008 8517 (3/4 inch soft domes... not piezos). I'll try wiring them directly. Getting at the XO may be a chore.? I have to find it first and if they are behind the woofers, then I have to get those off which are essentially glued on with sealant.
