Jax2, is it likely the mid 80's La Scalas do not have the K55M and the K77? Is this something that was added to the newer models?
Actually the drivers and crossover I recommended are from the older models and were replaced with less desirable components (arguably so). My suggestion to replace the tweet is not with another Klipsch, but with a drop-in Beyma replacement. I was using a Fane 2020 slot tweeter for a HUGE improvement in the high end. AA is the best of the Klipsch Xovers, IMO, but you can replace those with modern versions of the same Xover by either Bob Crites or Dean Westcott, or a completely revised version by Al Klappenberg. As far as which works best, YMMV. I think the AA is a damn good Xover, but they will come with older components which could stand for improvement just from an age standpoint. Elevick makes a good recommendation on the Cornwall alternative, although the size and weight is not that far off. A tube amp would be an ideal companion, again, IMHO.
Marco