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ADJUSTING ANGLES
By using both MAPP Online and the M3D Placement
Calculator, you should now have determined the required
tilt for the MTG-3D Top Grid and splay angles between
elements for your array.
The M3D Placement Calculator (see “M3D Placement
Calculator”) also provides a warning indication if the
center of gravity falls too close to, or outside of, the
front or back point that was chosen in the array’s nal
conguration.
MTG-3D TOP GRID TO FIRST M3D ANGLE
ADJUSTMENT
The MTG-3D Top Grid allows for an adjustment of 0˚ to
±5˚ between the MTG-3D Top Grid and the rst M3D
loudspeaker.
If your conguration is front-to-back type A, E, or F as
described in “Appendix A — Congurations and Load
Ratings,” the entire vertical array of M3D loudspeakers
can easily be tilted up or down to help focus the array’s
coverage onto a target area by adjusting the front and
back motor points.
The total allowable tilt of the MTG-3D Top Grid with an
array hung under it is ±25˚, provided that the center of
gravity of the array remains inside the MTG-3D Top Grid.
CAUTION: Note that the weight on each
motor shown by the M3D Placement
Calculator is the static load when the
loudspeaker array is in its nal position and
DOES NOT calculate dynamic forces induced
during setup. Each set of front and back
or side-to-side motors should be sized to
withstand the full weight of the loudspeaker
array.
!
If the array must be hung in a side-to-side hanging
conguration (conguration B, C, or D in “Appendix A
— Congurations and Load Ratings”), you can set the nal
rigging tilt angle for the array by using the MTG-3D Top
Grid’s rear link adjustment. Using the links of deck chains
or using different lengths on the two bridle legs from a
motor are effective methods of achieving tilt on a MTG-3D
Top Grid.
Figure 15 and Figure 17 illustrate how the MTG-3D
Top Grid's CamLinks and rear links can be used for a
necessary tilt adjustment of the rst M3D.
0˚ to -5˚
Figure 15. The MTG-3D Top Grid’s link in retracted position
Adjusting Top M3D Top Grid Downtilt
With the MTG-3D Top Grid’s rear link in the retracted
position (as shown in Figure 15 and Figure 16), the front
CamLink can be adjusted to provide between 0˚ and
5˚ of downtilt. The MTG-3D Top Grid’s rear link works
in combination with the front CamLink to produce the
desired angle of downtilt.
Figure 16. The QRP securing rear link in retracted position