Well, I went ahead and picked up these speakers in the end. I got them for cheap, and I'm hoping I can refurbish this set. It ended up being that one speaker was completely dead. The other worked but once we turned it up a bit, we heard a bit of a pop, and the ribbon section went dead, while the rest continued to operate.
I tried new fuses on both speakers to no avail. I'm hoping that both these speakers have well functioning ribbons and are suffering from some kind of wiring, or crossover problem. Can anybody recommend a shop to do repairs on these babies in the Southern California Area? Thanks.