You won't have any problems. I had the 8's in a room about the same size.
Will bass overload room?
Currently considering the Monitor Audio RX6 floorstanding speaker, but I'm concerned with the bass overloading the room (12'x 16' with 8' ceiling). The room is fairly well damped with curtains, carpet and a sofa. The speakers will be driven with a 35-40 watt EL34 tube amp. Does anyone have experience with this speaker in a similar size room or an opinion/suggestion? Thanks!