Quote: Originally Posted by jhbrandt My recommendation would be; Absorptive ceiling (50%). The rest could be checker-boarded with PRDs - like the RPG skylines. Hmmm... I would also recommend changing those dimensions a bit. - All three dimensions have 10 in common - this could be very bad in terms of modal activity and make the room 'hum the tune'. If you cannot change dims - go with a fully absorptive ceiling - and/or maybe make a shorter wall double slanted (Geddes approach) to throw the waves into the oblique. Cheers, John What do you recommend to be the distribution of absorbent and RPG diffusors? Would alternating them be a good idea?