Genelec GLM 4 System Operating Manual page 37

Genelec Loudspeaker Manager (GLM) 4 - System Operating Manual page 37 of 87
Back, side and floor reduction modes.
The 3 remaining modes of operation are the 'null modes'. In these modes, individual filter sets are
recalled, that provide directivity patterns that have been optimised to provide reduced output in the
direction of primary reflections from the floor, back wall (behind the speaker) and side wall.
Back wall
phantom image
source
Side wall
BACK WALL
SIDE WALL
phantom image
MODE NULL
MODE NULL
source
DIRECTION
DIRECTION
FLOOR
MODE NULL
DIRECTION
Floor phantom
image source
Figure 21. Diagram showing the maximum null location angles for the individual modes*
*N.B. diagram only shows the angle of maximum attenuation, however attenuation outside of these
angles is also given (see contour plots in operating manual for more detailed plots).
Contour directivity plots for all the directivity modes can be found in the Wooofer System operating
manual.