The JBL L-100 Century is JBLs most famous vintage speaker from the 1970ies and is an absolute classic. It has been produced in several versions over the years, so it is well possible to find slightly different midrange and tweeter placements. You can find an example of a newer design at the end of this article.
When JBL focused on offering foremost consumer electronics (vs. professional studio equipment) in the 70ies, it started the L100 model, which became the most sold speaker model up to that date. No other company had produced a speaker with similar sales. Therefore JBL continued to build and sell the L- series and introduced newer versions with improved drivers and crossovers throughout the 80ies.Those newer speakers of the L-series do not have much in common with the original L-100.