Term: SBIR

Speaker Boundary Interference Response. The distance of the face of a loudspeaker to a nearby boundary creates an acoustic cancellation at a frequency whose wavelength is equal to 4 times that distance. The direct sound interacts with the reflected sound and a destructive cancellation (notch) of between 6 dB and 25 dB occurs. SBIR is reduced by optimizing the speakers’ positions in a room.