Update: We spent a fair amount of time this evening marveling over the numerous differences in construction between the two cabinets. Some of which are very visible back in post #1 of this thread.

Measurements of the DC resistance on the woofers are:

Gray (1955 - 12 ohm rated) set: 8.6 ohms + 8.6 ohms measured
Green (1957 - 16 ohm rated) set: 8.3 ohms + 8.3 ohms measured

Compression drivers are:

Gray (15 ohm rated): 8.8 ohms measured
Green (16 ohm rated): 8.3 ohms measured

Do these DCR values seem low? At least they are pretty consistent with each other.

Still under discussion is if we should replace the crossover caps in the N800Ds or not. Both N800Ds have 10.5 mfd caps in them, but he has not had a chance to measure them and see if they are still in spec yet. (As a friend of mine likes to say - "To measure is to know".) If the caps are out of spec, it may just as easy to leave them as they are and build new crossovers. Or maybe bi-amp them? (I could buy a cheap Behrenger active crossover for what new crossovers would cost. I already have the amps.)