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7.5.2
OPERATING LIMITS
While the NTS250 processing includes robust driver and amplifier protection algorithms and circuits,
it is ultimately the responsibility of the audio system operator to operate the loudspeakers within their
capabilities. This is the only way to ensure that loudspeakers are not stressed beyond their limits to the
point of damage or failure.
Operation beyond their capabilities usually includes, but is not limited to, one or more of the following
conditions:
Severe amplifier clipping
Noticeable distortion
Mechanical noise (such as cones bottoming out)
The NTS250s have both Limiter Active and Clip indicators. A suitable means for determining if these
indicators are active is highly recommended. At a minimum, the operator should have a meter display
calibrated to indicate the level where the NTS250s Limiting and Clipping point are and thus be near to
exceeding their capabilities.
As an alternative to a mixing console or other meter display, the EAWPilot provides real-time meter
display of the NTS250 levels.
8.
RIGGING & HANDLING
NTS250 arrays may be suspended via M10 mounting points or the accessory FB152 Fly Bar, ground-
stacked, or used as pole mount bases. This manual will cover subwoofer suspension using M10
mounting points and pole mounting applications. Suspension using the FB152 Fly Bar and ground-
stacking applications are detailed in the FB152 Rigging & Ground Stack Instructions. Both
documents recommend rigging and handling 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 to implement them accordingly.
8 . 1
R I G G I N G OV E RV I E W
The NTS250 subwoofer has two (2) Rigging Tubes on each enclosure
side – four (4) in total. Each Tube contains a captive Latch which slides
down and attaches to the Rigging Tubes of an adjacent enclosure via a
46 mm / 1.75 in Quick Release Pin – see Figure to the right.
DANGER: Ensure each Quick Release Pin used in assembling an array
is fully inserted and engaged into the Tube and Bar holes. Only use the
supplied Quick Release Pins or equal. Pins of different lengths,
diameter, or material will compromise the structural integrity of the
rigging system and may result in damage to the equipment, injury, or
death.
Each product also includes four (4) M10 threaded Permanent
Installation (PI) suspension points on enclosure top and
bottom. The figure to the left illustrates their locations in the
NTS250 top panel. M10 forged shoulder eyebolts or similar
load-rated hardware may be used in these points when
deploying NTS250 subwoofers in permanent installation
applications.
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