johnk, Why do you have trouble understanding that 30s speakers may perform as well or better than current speakers FOR YOU and your listening preferences, but others find that much progress has been made since then and prefer current speakers. I’d bet that you couldn’t find a single speaker manufacturer who would be interested in doing reproductions of speakers from the 30s.
I see this discussion playing out all the time. Someone insists that everyone should want what he likes or owns. It just doesn't work that way.
If you want to discuss patents and when concepts were first published, you can probably find a better place to do it.