Hales Revelation 3 Crossover Help

According to the impedance curve posted, these speakers used a 4 ohm woofer and most likely a 6 ohm mid and tweeter. The woofer at one point drops to below 3 ohms, this is most likely why you are reading a 3 ohm dcr. Nominal means no more than average impedance over its operating range.
Also,  the method that Erik is referring to,  you would add the appropriate resistor to the tweeter only (wherever the caps were replaced)

what kind of problem are you having? 

This speaker uses 4th order crossovers with all film on top. The concept that Erik is referring to should not happen with smaller tweeter caps when only tweeter caps are replaced.
There have been at least 2 other threads where the ESR issue was raised.... I say at least, because on 2 occasions, I received private messages from the ops looking for help to work through the problems. Each issue was different. First Verify that the correct replacement diaphragm was used also If the diaphragms got to hot putting them in, that can make the changes that you are referring to. I don’t drink, how about a hamburger.