HD1521
Rigging
HD1521s may be individually flown horizontally or vertically using M10 X 1.5 X 37 mm forged shoulder eyebolts.
WARNING: Installation should only be done by
an experienced technician. Improper instal-
lation may result in damage to the equip- ment, injury or death. Make sure that the loudspeaker is installed in a stable and secure way in order to avoid any conditions that may be dangerous for persons or structures.
WARNING: The cabinet is suitable for rigging
via its fly points. NEVER attempt to suspend 
the HD1521 by its handles.
Rigging Design Practices
Rigging a loudspeaker requires determining:
1.The rigging methods and hardware that meet static, shock, dynamic, and any other load requirements for supporting the loudspeaker from structure.
2.The design factor for and the required WLL (Work- ing Load Limit) for this support.
Mackie strongly recommends the following rigging practices:
1.Documentation: Thoroughly document the design with detailed drawings and parts lists.
2.Analysis: Have a qualified professional, such as a licensed Professional Engineer, review and approve the design before its implementation.
3.Installation: Have a qualified professional rigger do the installation and inspection.
4.Safety: Use adequate safety precautions and back- up systems.
12 Fly Points |
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| MP | MP=Mounting Point | |
MP | MP | MP | |||
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| MP |
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| MP | MP |
MP | MP | MP |
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| MP |
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Two per side | Two on the rear | Three each on the top and bottom | |
Flown Horizontally |
| Flown Vertically |
Rear Fly Points |
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(adjust angle) | Top Fly Points | |
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Side Fly Points
Lower Rear Fly Point (adjusts angle)
HD1521 |