Just happened to run across a topic which featured the quoted phrase. And elsewhere I've often seen references to "pro" audio, both in discussions and in product model names. But I've not encountered an explanation of what "pro" denotes in the context of audio gear, if it's not merely marketing fluff. I can infer that "pro" gear might be better able to withstand being moved about from place to place, or perhaps to produce high SPL in large spaces as for concerts. But are there any audio-related functional attributes to distinguish "pro" drivers, or enclosures, or amps, from "home theater" equipment that a DIY home theater builder should know about?