Ella is loud; if she's purring, it's easy to hear her in the next room. But she's not THAT loud!
Just as a point of interest, I think 92 decibels at 18 inches is the recommended maximum for proposed exhaust noise legislation for motorcycles and hot rods.
I saw that before, but I don't think that is a purr.
It sounds to me like its just an unusual meow using the vocal cords, which is why it can register so loud. Purring I thought was really just spasms of the diaphragm.