Martin Audio MLA User Manual page 450

MLA System
USER GUIDE
Now place the first cabinet flat on top of the grid being careful that the exposed bracket doesn't damage the bottom of the
cabinet, always lift it into position rather than dragging it. Secure it into the bracket at the front of the grid with a flying pin;-
You are now ready to set the angle at the rear using one of the two ground stack bars. There is a long and a short bar the use of
which is determined by your Display 2.1 design. If the bottom cabinet has an upward tilt the short bar is used, if it has a downward
tilt the long bar is used.
The first step is to calculate the angle of the bottom cabinet which is done from the MLA Compact Pick Loads spreadsheet which
has a tab for ground stacking. You enter the calculated angles from the project design in the yellow section and the angle for
each cabinet with respect to the horizontal is shown in the blue panel. The key figure is the angle for the bottom cabinet. If it is
tilting upward the short ground stack bar can provide angle of 0, 1, 2, 3, 4 & 5⁰. The Long bar takes care of down tilts or negative
angles. The following angles are provided for;- -1, -2, -3, -4, -5, -7.5, -10, -12.5, -15, -17.5 & -20⁰. Both bars have a number of
holes; the combination to use to achieve the desired angle is shown on a table printed on the side of each bar. For the short bar;-
MLA System User Guide V2.1
450