Nexo Geo M6 Series, Системное руководство

Страница: 18 / 64

CONFIGURABLE DIRECTIVITY DEVICE
Page 18 / 64
System Manual GEOM6
5 C
ONFIGURABLE
D
IRECTIVITY
D
EVICE
The GEO Wavesource controls dispersion of acoustic energy using a hyperboloid acoustical
reflector in the “coupling plane”
(the vertical plane of a curved vertical tangent array) and a diffraction slot in the “non-coupling plane” (the horizontal plane of a
curved vertical tangent array). The patented Configurable Directivity Device consists of
flanges that alter the diffraction slot’s
exit flare rate.
5.1
Installing & removing GEO’s Configurable Directivity flanges
GEO M620 are shipped in the 80° dispersion configuration, 120° flanges is an optional accessory (GMT-FLG)
To change horizontal dispersion from 80° to 120° and vice-versa:
- Remove the front grill (TORX15, drawings below);
- Remove the 2 TORX screws per flange on each side of the GEO Waveguide (drawings below);
- Install or remove the 120° flanges with the 2 TORX screws
- Re-install the grid, being careful that the NEXO logo must be on the woofer side.
5.2 When & where to use Configurable Directivity flanges
The diagrams show audience area coverage for a stereo system. While a GEO cluster will deliver even SPL from the front to
the rear of this
audience area, there are “holes” near the front in the centre and at the outside edges. We cannot fill the outside
coverage gaps without enlarging the centre gap, and vice versa (left figure below).
If 120° Configurable Directivity Devices are installed at the bottom cabinet of the clusters, coverage will look more like the pattern
in right figure below.
-6dB coverage, all GEO M620 in 80° configuration -6dB coverage, bottom GEO M620 in 120° configuration
In curved vertical arrays, the 120° Configurable Directivity Device can be used:
- On the bottom row of curved vertical arrays, to fill in coverage gaps in the front rows.
- On all rows of curved vertical arrays, in cases where 120° of horizontal coverage is preferred to 80°.
IMPORTANT
Installing or removing one of the two flanges anticipating asymmetrical coverage will degrade both coverage and
frequency response.