Thank you for the welcome.
I have a pair of what were Pro LSI from around 1990-ish. Serial numbers look like they were on stickers and wore away. I listened to the speakers and thought one sounded off. Thought it was maybe a bad tweeter or bad diaphragm etc. I only opened up one back and saw the AL-3 crossover so I was happy with that. When I went to check tweeter that sounded bad after I got them home, I noticed that one had the older AL crossover. I'd like to keep the crossovers OEM and like them both to be the AL-3's
The mids and tweeters in both are the M variety K-77M and K-55M