I currently have a mastering room that measures approx.:
length = 7m50cm
width = 5m70cm
height = 2m50cm
It's been treated with broadband and bass traps (quite deep superchunks in the front corners), absorbtion at all primary reflection points, and absorbtion on the back wall behind the listening position. It measures quite good, and sounds good.
The back wall behind the listening position is a row of ceiling high cupboards, and only about 1m away from the listening chair.
I'm considering tearing them out to open up the room. This would give me the following measurements:
length = 10m20cm
width = 5m70cm
height = 2m50cm
It would also move the back wall (and reflections from it) much further away from the listening position. However, I have to have shelf space somewhere, so the new back wall would have a kitchenette as well as new cupoards/shelves, making a diffusor or other treatment on the rear wall difficult.
I've considered putting absorbers behind the listening position on stands (i.e. gobo's) or hanging them from the ceiling, but am not sure if this is needed or if it will actually help.
Obviously I will have a professional come and have a look and try out some alternatives, but wanted to hear any ideas here as I prepare the expansion (I really need the extra room for clients, etc)
Cheers,
Thor