My speakers were Vifa kits from years and years ago back when Vifa were still making drivers in Denmark. The cone and surround is plastic and rubber, not paper, and they still sound as good as when I first put them together.
But then, my Dad can recone speakers. :-) Though he knows someone a few suburbs away who will do it better. Currently Dad is trying to restore a valve radio from (we think) 1934. We can't even find a circuit and some bits don't make sense. And I'm getting an education in valve radio circuits...
Wade.
P.S. Valve = tube for those unfamiliar with the alternate terminology.