@Brien Holcombe Brien - using Bob Gold's calculator, how do I calculate a room of varying widths? I'll be more specific ... I'm looking at moving into another area of my house - it's a Living Room area - where in half of the section, a staircase cuts into the width by 3 ft. So, Length is 23' uninterrupted ( with the exception of the doors, doorways to other areas, and windows), and in half of the area, the width is 14', 6"; but in the other half, the width is only 11',6" because of the staircase. The staircase is not fully walled-off on the side facing into the room though, the drywall follows the steps as they go up, so from a side view it looks like this: Ceiling Height in the main area is 7', 6" - except for above the steps, where it's canted to follow the staircase, going up to an eventual height at 14' 7" (measured from the floor in the main area to the ceiling at the very top of the staircase). I understand Bob Gold's calculation software is for "basic" L/W/H room dimensions; but the room I'm considering isn't really all that common, because of the way that the staircase intrudes into the space. I'm baffled ( no pun intended LOL) on how to accurately measure this room... not only from the approach of plugging in the measurements into Gold's calculator, but also acoustically as well. Here's a quick and dirty bird's eye layout of the area, with measurements: Other details: Walls and ceiling(s) were put up in the early 1940's, so whatever type of sheetrock was being used at that time is probably what it is. It's not "typical" modern drywall... Floors are hardwood, uncarpeted; right now I don't even have any area rugs... (although I do have two sofas which are cloth covered and which have some mass because of how they are filled...) I guess I should just come out and ask if in considering using this area as a mixing space, am I begging for problems here? Any help you could give would be greatly appreciated.