[Bob Crites CT120 tweeters]

Just ordered my E2 crossover and CT 120, will let know the results!

[Production Date from serial numbers?]

Sherry also inspected my 84 Klipsch Heresey I. 

[Differences between the Heresy Original, II and III (what are they)]

I have Heresey I, unmodified and I really love the sound.  Have them paired with a couple of subs.  I was about to pull the plug on the crites crossovers for the models but then was disappointed with some of the reviews I read after the modification.  At present, I'm not convinced for doing any modification to them.  

[K-77 diaphragms]

Question. Why is Bob so Highly Regarded?  I have a pair of Heresy I, and am unsure if the investment in new crossover and CT 120 tweeters would be worthwhile.  Have  read various forums which state they are too dominating and lead to some fatigue over the 77 original tweeters.  Please share if you have similar issues experience?