No, I don't know anything about it. But that hasn't stopped me from opinionating before, why should it now?
Looks like maybe a LE15B woofer on the bottom, don't know what's on top - maybe another mfr? LX5 would be for 500hz crossover to a 375/2440/2441, which isn't there. Enclosure looks like the back panel is particle board, sides are plywood, which makes me think homebuilt with scavenged parts, and maybe they kept the crossover just to fill the hole? It's also not ported, so it's doubtfully engineered. Lastly, I don't remember JBL ever doing a box with diagonal drivers on the face until the THX theater stuff in the early 90's, which is way out of the vintage of these parts.
IMO, you've got a crossover, a fair quality JBL woofer with a damaged cone, and an unknown, probably worthless second woofer. I'd pass, but let someone else chime in, tell me everything I said was wrong, and you are looking at Ed May's lost bass rig that's worth millions