As I said in my last post, I pulled the horn from the monitor in amp channel A that produced no sound, and swapped it with the horn in amp channel B that sounded perfect. The problem stayed with the monitor in amp channel A. The horn in amp channel B now sounds perfect.
So, I would say it's a problem with the crossover. I fiddled with its wires, and each component, and all seems firmly intact. Visually none of the components appeared to be burned, or melted. Is it possible for me to blow a crossover?
Yes it is easy to damage some crossovers. Since we don't know what kind of monitors you have-we have no idea how easy it may or may not be to damage the crossovers.
And of course there could always be a' "Break" somewhere.
Very often poly capacitors don't show anything when they are bad. Paper ones will usually "explode" and be VERY evident.
And wirewound resistors will sometimes open up without showing any evidence.
If you would post some photos of the crossover-that might help.
When you measured 7 ohms across the diaphragm-did you disconnect one of the wires to it? If not-then you could be reading the "backside" of the crossover.
You are going to have to provide more information to get more help.
So model numbers and photos of the crossover would be a good start.