8
PHYSICAL INSTALLATION
NTL720 Series arrays are intended to be suspended or ground-stacked. This chapter details how to
physically configure NTL720 Series arrays. The following are the recommended methods for most
situations. Specific situations may require other methods. It is the user’s responsibility to determine the
viability and safety for alternate methods and implement them accordingly.
8 . 1
R i g g i n g W a r n i n g s
WARNING:
Suspending anything, especially overhead of people, should be done with extreme
caution. Always engage the services of a certified professional who is qualified to determine the
requirements for and to implement overhead rigging. Only persons with the knowledge of proper
hardware and safe rigging techniques should attempt to suspend NTL720 Series arrays overhead.
Failure to follow these precautions may result in damage, injury, or death.
DANGER:
When suspending or stacking NTL720s, avoid placing any parts of the body between
the enclosures or between an enclosure and the Fly Bar. Always use the integral handles to lift or
position enclosures. Failure to follow this precaution may result in damage, injury, or death.
CAUTION:
An NTL720 weighs approximately 47 lb / 21 kg. This, along with the physical size,
means that one person may be able to lift and carry it. However, always use proper lifting
techniques to avoid injury. Use good judgment to determine if you need lifting assistance such
as another person, a back support belt, or mechanical assistance.
IMPORTANT RIGGING WARNING:
Each captive Quick Release Pin, used to attach
enclosures together, can be inserted into one of several holes in the rigging end caps integral to
the enclosures. The particular hole is used set the splay angle between the enclosures and thus
their aiming. Use the correct holes as determined by the NTL720 Array Wizard. Always insert
the pins from the inside of end caps. The pins will not properly engage if inserted from the
outside of the end caps.
8 . 2
G r o u n d S t a c k i n g
Up to six NTL720 loudspeakers may be stacked using the FB172 Fly Bar as a base. You can purchase
the FB172 Fly Bar w/ Ground Stack Kit (LOUD P/N 0025596) or the FB172 Ground Stack Kit (LOUD
P/N 0020646), which is used to convert the FB172 Fly Bar into a stable, adjustable base for stacking the
NTL720 loudspeakers. Installation instructions are included with the kit.
8 . 3
F l y i n g
Up to 16 NTL720 loudspeakers may be suspended from an FB172 Fly Bar (LOUD P/N 0023890),
depending on whether the array is a straight or curved column. Installation instructions are included
with the Fly Bar.
8.3.1
SUSPENSION LOAD RATING — WORKING LOAD LIMIT (WLL)
The WLL (Working Load Limit) for the Fly Bar is determined by the NTL720 Array Wizard, depending
on the array configuration.
The WLL (Working Load Limit) for the rigging on each NTL720 is 752 lb / 341 kg.
The design factor for these ratings is 10:1.
WARNING:
It is the responsibility of the user to ensure the attachment to the Fly Bar, the rigging
method, and attachment to structure are inspected by a certified professional who is qualified to
determine the requirements for and implement overhead rigging.
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