Any maggie advice regarding an old, but perfect pair of Tympani IVa's? These even have the original tweeters, which work perfectly. Are there tweaks/updates by now? Will a new pair of tweeters be of better quality than the 80's version? Would a modern re-paneling upgrade them in any way? Any upgrades for the crossover that are simple? These work fine, but I'm curious about improvements to ward off the new speaker itch.