I made a little time to take the cabinet apart this evening. I was wrong about the drivers and was off with the dimensions. Dimensions are 8.5" deep, 14" wide, and 54.5" tall inside. So, a little over 3.75 cubic feet. The vents on the back are 2" wide by 9.5" tall, with rounded ends. I could do the math and figure it out exactly, but 18 square inches seems right enough for me. The bottom driver turned out to be a 12, and it has an open circuit in it - infinite resistance. It looks completely different from the other two, but the hole in the baffle and mounts appear factory. It also has a metal dust cap with a vent in the center, like Kustom used in the '60s. Who knows. The other two are much lighter duty 10s. One works and measures at 10.6 ohms. The other one has an open circuit in it and doesn't work. They look like generic old speakers with small square magnets, unlike the 12, which has a big round magnet. The cabinet is heavy even without the two dead drivers, and the 12 is a heavy beast by itself. So, a little more head scratching.
It has a model "2+2" designation on its serial number plate. That's good for some intardweb research right there. Which has failed. Kustom maybe made four of 'em, decided it was a bad idea and stopped. Another who knows.
This cabinet may be one of the dumbest ideas out there, but I'm sure having a good time so far.
