My father has a pair of DCM Time Windows from 1977 or so, they are quite nice still and they were floor demo models! The main advances since then have been in tweeters for home theater effects but for music these are still great speakers.
On really old speakers they can go in and replace the wiring and some other parts (the rear connectors, etc) which can greatly improve the sound (by improve I mean restore to its original quality)...
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