Just picked up a pair of JBL 18Ti's for cheap. The speakers sound great and produce a lot of bottom end for 6 1/2's. I researched all the specs. The Ti18s are basically the same as the 4406 studio monitors with a cheaper crossover network and slightly different titanium high frequency transducers (tweeters).
If anyone is looking for specs on Ti series speakers I compiled a pdf which includes the original product brochure, engineering design specs and service manuals for the 18Ti, 120Ti, 240Ti, 250Ti http://www.ASPSTUDIOS.net/Equipment/...rs-Manuals.pdf