Cancellation because of a wall behind the
monitor
When there is some distance between the monitor and the wall, at the frequency
where this distance is equal to one quarter of the sound wavelength, the wall
reection is out of phase with the monitor, and the reected audio cancels the audio
from the monitor. At this frequency, the sound level is reduced. How much reduction
occurs depends on the distance and on how much sound the wall reects.
Sound
Source
Direct
sound
Reflected
sound
1/4
wavelength
Wall reections generate a set of cancellations at dierent frequencies (this is also
called comb ltering). The rst cancellation notch can be between 6 dB and 20
dB deep. Equalization of the monitor output level does not help, as the same level
change applies also to the reected sound.
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