CHAPTER 8: PBF-LINA PULL-BACK FRAME
40
VERIFYING PULLBACK REQUIREMENTS IN MAPP
To verify array pull-back requirements in MAPP:
1. Insert the loudspeaker array and configure loudspeaker splay angles:
a. Choose Insert > Insert Flown Loudspeaker System.
b. In the Flown Loudspeaker System dialog box, at the top of the elements list, set the grid to one of the following
options, depending on whether a LINA or 750-LFC is attached to the grid, and whether downtilt or uptilt is required.
The elements list is populated with loudspeakers set to default splay angles.
– MG-MINA rearward
– MG-MINA (MLK-750/750 forward)
– MG-MINA (MLK-750/750 rearward)
– MG-MINA (750 forward)
– MG-MINA (750 rearward)
c. To insert a transition frame or additional loudspeakers, click Add Element.
d. To remove a loudspeaker, select the loudspeaker and click Remove Element.
e. To change loudspeaker splay angles, click the angle in the Splay column and select the angle from the drop-down.
2. Evaluate need for Pull-Back Frame:
a. In the Rotation About Reference Point section (Figure 32), enter the desired downtilt of the array (negative value is
downtilt).
b. If the Front Rigging Load amount (at the bottom of the dialog box) is a positive value, no pull-back hardware is
required.
c. If the Front Rigging Load weight is a negative value (Figure 32), pull-back hardware (PBF-LINA) is required to achieve
the desired amount of downtilt (Figure 33). Make sure that the Front Rigging Load weight (the negative value) does
not exceed the maximum load ratings for the pull-back hardware (see “PBF-LINA Pullback Frame Load Ratings” on
page 38).
3. Verify whether the array complies with the required safety rating:
a. Use the Rotation About Reference Point (Figure 33) to rotate the array to the desired amount of downtilt (negative
angle value).
b. If the Load Status is green (“Loudspeaker Configuration is Within the Safe Limits”), the array is within the safe loading
limits. Proceed to the next step.
c. If the Load Status turns red (“Loudspeaker Configuration is Not Within Safe Limits”), the array is not within safe limits.
Return to the previous step and reduce the grid angle, reduce the number of loudspeakers in the array, or adjust the
loudspeaker splay angles.
CAUTION: For the best stability when flying arrays from multiple motors (for example, two motors attached to
the grid and one motor attached to the pull-back frame), make sure to distribute the load to all motors.
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