How do JBL serial numbers work and were they continued from one incarnation of the company to another. I have a pair of 150-4Cs with serial numbers 12832 and 12837. There is a pair currently on Ebay http://cgi.ebay.com/ws/eBayISAPI.dll...E:B:SS:US:1123 that are labeled 'Jim Lansing By Ampex' with serial numbers 21231 and 21235. I'm assuming that the latter are from an earlier company and that the serial number coding has nothing to do with JBL but I'm curious.

Bob W