The M2 is a studio speaker. I’m asking about speakers a wedding DJ might use, or a band playing in your local bar.
First off, there are good and bad pro audio speakers. The bad ones are really bad, but when you find a good one, they are great.
I think the number one reason most people don't even consider them for home hifi use, is their looks. Let's face it, most, if not all are not very attractive. Personally, when it comes to audio, I don't care about the looks. Something can be ugly as all get-up, but if it produces clear and accurate sound, i'm happy. Look at a lot of JBL or Klipsch speakers, basically pro audio 2 or 3 ways in a nicer looking package.
Yamaha club series is a good example, made in America, with eminence drivers and birch plywood. Very solid and heavy. I think they sound better than any of the Klipsch speakers (marketed and sold for home hifi use) that I have heard. Some years back there was a guy who measured a pair and was surprised how flat they measured, granted most won't go under 50-60hz, so a sub is recommended if you plan on using pro audio in a home environment.
What's great is they don't need a lot of power, but they can handle loads of power if given to them. I have a pair of the Yamaha Club V speakers, paired with an Anthem amp. They sound great, at whisper volume levels or cranked up. You can put your ear in the horn loaded compression driver and it's dead silent. I happen to have gone to school with a Eminence employee (no names mentioned) and he would be the first one to tell you, the drivers used in the Yamaha's are far above the ones used in the Klipsch offerings. (not trying to schit on those who love their klipsch)
So i would say the main difference between pro audio market speakers and home hifi speakers, is cosmetic and profit margins. Either can be good or bad. Price wise, PA speakers can be a very good value, if not concerned with cosmetics. Plus with pro audio speakers, usually your ears will tap out, before the speaker craps so to speak.