Flown Vertically
Flown Horizontally
Top Fly Points
Lower Rear Fly Point
(adjusts angle)
Rear Fly Points
(adjust angle)
Side Fly Points
1 Fly Points
Two per side
Two on the rear
Three each on the top and bottom
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.
MP
MP
MP
MP
MP
MP
MP
MP
MP
MP
MP=Mounting Point
MP
HD151
HD15
21
