The AR2412 has a fan, but I’ve never heard it without sticking my head behind it in the flight case.
It’s also been flawless in terms of connection. Had a gig with an disclosed noise limiter, it cut the mains several times from both the AR and the QU, they reconnected flawlessly and instantly every time.
There were issues with dSnake phantom settings on a desk causing issues when the dSnake wasn’t connected, but they’re resolved with release 1.7.3
I’d run with it as a stagebox in a studio without concern.