EAW N T L 7 2 0, Owner'S Manual

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7.3.5 AC LOOP CIRCUIT BREAKER
This is a resettable circuit breaker that protects the NTL720 from passing excessive current through the
AC Loop connector. Connect no more than four NTL720s to the AC Loop connector of a single
NTL720. If the circuit breaker should trip, the first NTL720 will continue to operate, but all the
NTL720s connected via the AC Loop connector will stop working. Determine what caused the circuit
breaker to trip and remedy the situation before resetting the circuit breaker.
7 . 4 S i g n a l P r o c e s s i n g
7.4.1 FACTORY SIGNAL PROCESSING SETTINGS
NTL720 array performance, in terms of frequency response, beamwidth consistency, output level
capability, and wavefront coherency is dependent on the crossover and other processing settings fixed
within the built-in digital processing. These settings are determined from extensive measurements in
typical venues as well as the theory of curved sources from the acoustical work of physicists Harry
Olsen and Leo Beranak. As such, they are required in order for the array to perform correctly and
should normally provide excellent results in a variety of venues.
7 . 5 U s e r A d j u s t a b l e D S P
7.5.1 EQUALIZATION
The EAWPilot software application provides access to standard, user-adjustable DSP functions to
modify the overall performance of the array to accommodate a particular program content, venue
characteristics, or personal taste in voicing. These include low-pass filter, high-pass filter, shelving and
parametric EQ, gain, delay, and polarity. It also provides access to signal routing (Input Select and U-Net
Send), as well as HF Boost (Air Loss) and Nearfield Contour settings for each individual loudspeaker.
7.5.2 ARRAY MEASUREMENTS
Smaart - The EAW Smaart program is an ideal tool to use to measure and optimize a NTL720 array for
a particular venue. This is a fast, yet sophisticated, process that will indicate problem areas due to
particular venue characteristics. Usually it is a matter of applying small amounts of 1/3 octave or
parametric equalization to adjust significant anomalies. A demo version of Smaart is available at
www.eaw.com.
7.5.3 OPERATING LIMITS
While the NTL720 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 NTL720s 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 NTL720s limiting and clipping points are to avoid exceeding
their capabilities.
As an alternative to a mixing console or other meter display, the EAWPilot software provides real-time
meter display of the NTL720 levels.
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