I think I will get entire system in the best shape I can and either sell them or replace one of my systems with them. So I built new bases for the Z7s.
I finally turned my attention to the center channel. It appears that it was resting on end in a puddle of water. The cabinet is swollen and not repairable, I hooked it up to my test amp and one of the midbass drivers works and the tweeter works but the other midbass, the one on the side damaged by water seems frozen. It will not move in or out. My guess is the water caused the voice coil or the gap to corrode and swell.
I would like to salvage as much as I can from the speaker. I am going to need to build a new cabinet, the simplest thing would be to find an identical driver, and build a cabinet with the identical dimensions and migrate the working drivers, crossover, and hardware to the new cabinet.
I haven't had any luck finding a driver that looks like the damaged one. The only marking on it is "5AL7" and a date code "20050429A." The cone is aluminum (silver), what looks like phase plug is black and moves in and out with the cone (except on the one that doesn't work). The surround appears to be rubber not foam, and it has a cover over the magnet assembly, similar to what was used to cover bucking magnets for shielded speakers. It is a unique cast aluminum frame, in that the "spokes" are curved, not straight.
The overall frame diameter is ~5-7/8" (~147mm). The cone diameter is ~5" (125mm). If anyone has any ideas of what type driver it is, and/or where to look for the driver that would be great. I have checked PE, Madisound, Meniscus, GR-Research, CSS, all the usual spots.
If I can't find a suitable driver, then at least a portion of the crossover will need to be redone.