Hello, I just picked up my fist pair of Klipsch's...a pair of evidently early Heresy's. I would like to learn as much as I can about them, eg, date of manufacture, driver details, original grill type, etc. One of the tweeters is not working, and I suspect the crossover could use a refresh. Looks like CritesSpeakers is the place to go for repairs and crossovers? The serial number for one of them is 10M053. Thanks for any info.