Speakers "Too Big" for room

As it has already been said above, it completely depends on the room. It’s much harder without a dedicated space that you can modify to work. My room was designed by an acoustician and  has no drywall inside. Amazing results 

My first pair of Maggie's were MG2.5r's. Then I moved to the MGllla's all in a much smaller room you have listed. I knew one day I was going to move them to a larger space. I enjoyed them anyway, the clarity, the full body of speaker able to fill that small space made it all worth it. Sometimes more is just more...

Enjoy the Music

Is the office in a modern concrete building or in a wooden shed? I have small monitors in a big room and they load the room horribly. You may guess what material has been used for construction. 

Wood construction.

You will see and hear no advantage of  big speakers in a moderate sized office. Bookshelf speakers would sound and feel more elegant.