I heard of that, they are not there. I took the speakers to a Klipsch Dealer in Williamsport, Pa and was told the reason there are no serial numbers is because they would have been stamped on the original back plate. Since they were replaced with Chorus crossovers which are just components not a complete speaker system there would not be serial numbers stamped. I was also told that the Chorus crossovers should be a seen as a slight upgrade. Would that be true.
To Carlthess40, I am located in York, Pa.
thanks for all the tips and advice.