I recently purchased a pair of very rare Dale speakers from 1957. They have one 7" full range driver, a port and a curious blanked-off space thought to accommodate an optional tweeter. (Not to be confused with the "rocket" tweeter used in the similar Bel Aire speakers.) I wonder if others could shed some light, and the items needed to complete the upgrade? Thank you. Name:  20210828_234858.jpg
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