I think the old Klipsch are a good example. The magnets in the originals (when Paul Klipsch ran the company) were considerably larger and the speakers sounded much better.
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I think you will get a lot of yes answers to this post. Some of the classic speakers that sound great are now sold by more mass market companies that have reduced the quality. Also, sometimes the manufacturers change drivers and the speaker sounds worse. I didn't hear it personally, but it was reported that the Wilson Watt/Puppy 6 wasn't as good as the 5 whereas the 7 was much better than the 6. I'm sure there are many examples.