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GENERAL
This appendix contains various hanging congurations
for M3D loudspeakers using an MTG-3D Top Grid. This
appendix also contains allowable congurations of bridle
attachments, bridle lengths, attachment points on the
MTG-3D Top Grid, the maximum weight, and maximum
number of M3D loudspeakers for each conguration.
The maximum number of M3Ds that may be hung in each
pickup conguration is based on the M3D weight of 415
pounds (188.24 kg). The suspended weight listed in these
tables includes loudspeakers, the MTG-3D Top Grid, and
all auxiliary equipment supported by the rigging motor.
The weight values listed in the tables are the maximum
allowable weights and not the actual weight of the array.
CAUTION: The weight of any additional
items, such as ll loudspeakers, hung
with the array must be considered when
calculating the maximum load.
!
ABOUT THESE LOAD RATINGS
All the load ratings in this appendix rate the M3D rigging
system for the shifts in weight that can occur during
installation of an array while maintaining a 5:1 or 7:1 safety
factor. When ying an M3D array as discussed in this
manual, the entire weight of the array can shift completely
to either the front or the back motor or set of motors. We
have maintained this rating in all congurations shown
in this appendix in order to comply with the majority of
regional safety codes for theatrical rigging practices.
Scenarios shown in A, E, F, and G of this appendix
assume a “worst case” load between any single motor or
pair of motors and steel cable sets. If careful monitoring of
the weight distribution is maintained during the lifting and
nal trimmed position of an array, the motors and rigging
hardware capacities shown in the tables may be adjusted
accordingly to maintain a rated working load for your
region.
MEASURED ANGLES
Two angles are used in the following tables. The values
are shown in two columns: one is labeled “Angle between
Bridle and Grid” the other is labeled “Max Top Grid Angle.”
Angle Between Bridle and Grid
This angle (α) is measured between the top of the MTG-
3D Top Grid and an attached bridle leg. In the following
examples, the bridle legs are presumed to be of equal
length so the angle formed by each bridle leg and the top
grid are equal.
Maximum Top Grid Angle
This angle is used to determine the maximum amount of
tilt of the MTG-3D Top Grid from horizontal. The values in
this column are the maximum tilt angles allowed.
NOTE: The maximum top grid angle does
not include any array tilt obtained by using
the MTG-3D Top Grid’s front and rear links.
Bridle Leg Lengths
The various bridle lengths listed in the following tables
are the minimum required to support the corresponding
number of M3Ds listed.
CAUTION: Using a bridle leg shorter than
the recommended length may damage the
MTG-3D.
!
APPENDIX A — CONFIGURATIONS AND LOAD RATINGS