Focal SM9 or similar for home use

Thinking a nice tube preamp and dac into these may be a really good system! I have never heard studio monitors and don’t really understand the difference between regular ass speakers? I guess I know they don’t disperse the same but other than that I dunno. 

I think these would sound really good.

Your seating distance at 8’ away sounds about like a studio/mixing distance that they were designed for, but I’m not sure how they would react with your front wall (and throw a soundstage(?), or other ’audiophile’ characteristics, etc.) - or how well they would fill/use the large space that would be behind you in a 25’ deep room. But if uncomplicated|active and clarity of [mostly full range] direct sound at somewhat close distance, then yeah, definitely a different flavor, but ... ►► studio mixing monitor. I have a couple of pairs of active AVI ADM9s in my formal living room and guest bedrooms, and the ease of use case - (guests playing music from their phone with just a little bluetooth receiver between the speakers) is pretty sweet. (not in the same league as the SM9s, obviously).