| Re: replacement speakers.
Changing the tweeters will almost certainly require a redo of your crossover. Each crossover is custom made for the specifics of the drivers installed.
As for changing the woofers -- if they're from 1971, they've probably degraded enough that replacement would be a good idea.. however, the size, shape and crossover details (again) of that box are specific to the woofer/tweeter combination.
I think this is a long winded way of saying it'd probably be better to start from scratch rather than shoe horn in some different drivers into your existing cabinet.
JCD
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