Hi Guys,

I'm wondering if anyone can help me to calculate the necessary data correctly for a room. A very good Producer friend of mine is building a new control room, and can't afford the big bucks to hire a consultant, so I'm trying to help him avoid some pitfalls before they start forging ahead with the building (I'm in Toronto, he's in the US). I make records. Plenty of em', but I'm not an acoustician.

The control room will essentially be limited to an 18' width, approx 27' (maximum) length, and a variable ceiling height (around 10' would be fine, but could be as high as 14' if necessary).

I've downloaded a fantastic Excel spreadsheet for calculating room modes, mode density, and mode distribution on a Bonello Graph.

I've read a whole bunch on this board, and I'm trying to understand the practical application of the Bonello criteria in terms of ratios, etc....

He would like to angle the front wall in on a 45deg angle on each side (I suggested a 30deg angle). Even though the longest axial dimension around the room is unchanged, should the dimensions in the room-mode calculation be adjusted for the reduced volume in the room?

For instance, if they angle the front wall in at about 54" from each side on a 45deg angle, they would reduce the overall square footage of the room by 40.5 sq ft, and therefore reduce the volume of the room from 4860 to 4455 cubic feet (assuming it was 27' in length).

Any help on this would be hugely appreciated!

Cheers from Toronto...