Sorry, the chronology is confusing.
I wanted to get the JR149s going again as a second hifi, they'd not been used for a while having been lent to my nephew. Also the Roksan amp hadn't been used for a while either as I'd been using my late fathers hifi since he passed away. When I tried using the JR149 / Roksan something was obviously wrong, I worked out it was the original bass drivers so bought 2 new B110s from falcon. I assumed my nephew had just returned them having burnt them out so didn't think much about it. They weren't used much for a while but when I tried to use them it was apparent I again had problems with one, I returned to falcon who said it had burnt out. I bought 2 more! Again after occasional minimal use I found I again had problems somewhere. This prompted me to start looking elsewhere and question my amp / preamp. I took this to a hifi repair chap who looked and said the caps in the amp were leaking and wanted £200-£300 to replace 12 caps. I declined. I've now replaced the 12 caps myself (around 8 were obviously leaking) and tested the amp with other speakers and earspeakers and the amp is now fine, however it appears the amp has 'blown' the second pair of falcon B110s, or as you suggest, melted the varnish. It occurred to me I still had one good B110 which I've tested in one speaker and that's fine now, so I think my amp blew original bass drivers and one B110 replacement. However the amp is now fixed, but I only have one working bass driver.
Is there a way to fix the melted varnish or do I need yet another pair of B110s? (Expensive game this, all for the sake of 12 caps).
Thanks