That's the Fender-era 2x15 cabinet. Originally, it contained two unidentified 15" drivers. Cabinet is pretty lightweight, made of plywood, with a couple of 2x4 crossbraces. Pretty loud, lots of mids. I thought it was lacking a bit on the low end, especially for a 2x15 designed to go under a 4x10.
I replaced the drivers with JBL 2220's. Surprisingly similar sound, though the JBL's had another octave on top. I'm sure some people would love it, but I was looking for a deeper response.
Last night I took the 2220's out and replaced them with K140's. While the cabinet was empty, I lined it with ½" foam. It was already past my bedtime when I finished, so the report on how it sounds will have to wait until tomorrow.
The plan is to use it Sunday at the
Emerald Empire Hempfest.