White Paper Acoustic Control Co. The loudspeakers energize the modal resonances at their respective positions in the room .
All room modes end in the corners of each room.
It is not practical to acoustically treat each mode seperately . In order to absorb the needed amount and level of low frequency energy in small room environments , one must use an absorber that is capable of absorbing energy down to the lowest level that todays speakers are capable of producing. With low frequency levels of 40hz. The absorption of sound in the mid and upper frequencies can be realized by porous absorbers. Glass fiber, foams, acoustical tiles, and carpet are all examples of common porous absorbers .