I've owned my Lascalas for over ten years now and have just gotten around to identifying the serial numbers. It looks like they are from 1975, serial numbers 4N891 and 892. They've got AA crossovers which I changed with the Crites capacitor kit a few years ago. I also built the ported bass bins which really added more than it subtracted, so they are staying put for now. I may one day try the Qpie bass bins, we'll see.   They were my initiation into the world of Klipsch and have led me