Help with low ceilings

Hello: I have some problems with my control room; it is small (3.30 x 5.10 mts), and the ceiling is angled in the front, but low (2.20 mts). What kind of material should i use in the ceiling, absortive ( i have tons of high density foam) or diffusors ( i have two Obeta Diffusors) and where should i place this materials, or should i use both? I appreciate any help. Alejandro

With a ceiling that low, absorb as much as you can. If you can get 2 inches of rigid fiberglass on the ceiling, that'll help out a lot. The foam will work too, if you've got it lying around (open cell foam, right?) but the diffusors will most likely cause more problems than they solve. Hope this helps!

Thanks a lot Dymaxian! I will start making my ceiling as absortive as possible. Do you think it will do any good to place the diffusors in the back wall? Thanks a lot.