My family room is about 45 X 14. Though the seated listening area is about 16 X 14, the 1070 has no problems filling the room with sound. If your speakers are not super difficult to drive, and you don't listen at ear-splitting levels, I don't think power will be a problem.

I have had a Yamaha RX-V659 in my set-up before the Outlaw, and the 1070 sounds far more powerful to me.