Will Revel Studio2s fit in a 15'x18'x9' room?

Treat the room with bass traps and you will be fine.

I would go for it. The room's not THAT small, and you can trim the speaker's bass characteristics with the rear mounted controls which actually work very well. Good luck

I own Studio 2's and my former room was 14x18 with a ceiling vaulted to 10'. If you have placement flexablity and can use acoustic treatments as needed, bass traps being the most likely, you'll be fine. They sounded great in my room.