good info above - flat ceilings are much easier to deal with in terms of calculations and empirical treatments; the same is true for rectangular walls vs. trapezoids
read more in the Master Handbook of Acoustics
no matter what, I predict you will wind up with some pads up in the corners of the ceiling & 2 walls
read more in the Master Handbook of Acoustics
no matter what, I predict you will wind up with some pads up in the corners of the ceiling & 2 walls