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Table 4. Minimum Allowable Bridle Leg Lengths with Varying Number of M3D Loudspeakers
Maximum Number of
M3Ds
5:1 Safety Factor 7:1 Safety Factor
Maximum Angle
Between Bridle and
Grid α (deg)
Minimum Allowable
Bridle Leg Lengths
Maximum Angle
Between Bridle and
Grid α (deg)
Minimum Allowable
Bridle Leg Lengths
1 43˚ 3.00 ft. (910 mm) 47˚ 3.25 ft. (990 mm)
2 43˚ 3.00 ft. (910 mm) 47˚ 3.25 ft. (990 mm)
3 43˚ 3.00 ft. (910 mm) 47˚ 3.25 ft. (990 mm)
4 43˚ 3.00 ft. (910 mm) 47˚ 3.25 ft. (990 mm)
5 43˚ 3.00 ft. (910 mm) 52˚ 3.75 ft. (1140 mm)
6 47˚ 3.25 ft. (990 mm) 57˚ 4.00 ft. (1220 mm)
7 51˚ 3.50 ft. (1070 mm) 61˚ 4.50 ft. (1370 mm)
8 57˚ 4.00 ft. (1220 mm) 63˚ 5.00 ft. (1520 mm)
9 59˚ 4.25 ft. (1300 mm) 65˚ 5.50 ft. (1680 mm)
10 61˚ 4.50 ft. (1370 mm) 68˚ 5.75 ft. (1750 mm)
11 62˚ 4.75 ft. (1450 mm) 70˚ 6.25 ft. (1910 mm)
12 63˚ 5.00 ft. (1520 mm) 72˚ 6.75 ft. (2060 mm)
13 65˚ 5.50 ft. (1680 mm) 73˚ 7.25 ft. (2210 mm)
14 68˚ 5.75 ft. (1750 mm) 74˚ 7.75 ft. (2360 mm)
15 70˚ 6.25 ft. (1910 mm) 75˚ 8.25 ft. (2510 mm)
16 71˚ 6.50 ft. (1980 mm) 76˚ 8.75 ft. (2670 mm)
The suspended weight allowable for each bridle length is
shown for both a 5:1 and a 7:1 safety factor. These weights
are based on total suspended weight, including M3D
loudspeakers and an MTG-3D Top Grid.
NOTE: Each motor must be rated to support
the total weight of the entire array, including
any added equipment or loudspeakers.
The distance between lifting lugs in the congurations
shown in Figure 34 is 52.5 inches (1334 mm).
The minimum allowable bridle lengths shown in Table 4
are based on both a safety factor of 5:1 and a safety factor
of 7:1. Use the appropriate value when using Table 4 to
calculate allowable bridle lengths and allowable number of
M3D loudspeakers that may be hung in a specic venue.
NOTE: The maximum number of M3D
loudspeakers that may be hung in each
pickup conguration is based on the M3D
weight of 415 pounds (188.24 kg). The
suspended weight includes loudspeakers
and an MTG-3D Top Grid.