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

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Automatic Mode:
The interface will calculate the optimum number of enclosures, enclosure
splays, array aiming angle, fly-bar pick point and user-control settings. This can also be done
for a given inventory of NTL720s. Additional, user-variable criteria are provided for
application-specific output levels and for level consistency for near-to-far listeners.
Manual Mode: This provides complete control over the array’s configuration. The number of
enclosures, enclosure splays, array aiming angle, and fly-bar pick point are entered manually.
Complete instructions for operating the NTL720 Array Wizard interface are in the Help file.
5.1.3 COMPUTER REQUIREMENTS
EAWPilot and NTL720 Array Wizard require an IBM compatible PC with the Windows® 98,
Windows® 98SE, Windows® 2000, Windows® ME, Windows® XP, Windows NT® or Vista®
operating systems. It is not designed to work with Windows® 3.x, Windows® 95, or Macintosh®
operating systems.
5 . 2 F i l l C o v e r a g e
5.2.1 UP-FILL
Some applications, such as theaters and small arenas, can require up-fill coverage from the array. In
this case, the array is designed to tilt back for up-firing coverage from the topmost enclosures.
5.2.2 DOWN-FILL
Many applications require extreme down-fill coverage. In this case, the array is designed to have
enough curvature for the bottom NTL720 to provide coverage almost directly beneath the array.
5.2.3 HORIZONTAL COVERAGE AND SIDE-FILL ARRAYS
Regardless of the length of the array, a NTL720 array has a horizontal beamwidth (-6 dB points) of
approximately 110°, with pattern control maintained to a very low frequency.
The horizontal pattern also features “soft shoulders” that provide consistent frequency response to well
beyond the nominal -6 dB points. These soft shoulders can provide up to 150° of “usable” horizontal
coverage, albeit at somewhat reduced level. This off-axis performance also provides good acoustic
integration with side-fill arrays. In some cases, these shoulders may be sufficient for side-fill purposes.
5.2.4 NTL720 SERIES AS SIDE-FILL ARRAYS
NTL720 side fill arrays can be hung adjacent to the mains, extending the coverage to over 180° for
wrap-around audience coverage. For best results in most cases, align the bottoms of the the NTL720
array with the bottom of the main array.
5 . 3 G r o u n d S t a c k i n g
NTL720s may be ground-stacked. Normally, a ground-stacked NTL720 main array is used where
suspension is not possible, too difficult, or too time consuming. Additional uses are as stage side fills
and audience front fill. The recommended minimum number of stacked NTL720s is two (2) and the
maximum is six (6).
WARNING: Ground-stacked arrays, especially the maximum recommended arrays, requires
assembly by personnel qualified to ensure adequate stability from tip over for the particular
application. Mechanical assistance will normally be required to lift and position enclosures for
arrays taller than approximately 5 feet. For more information on ground stacking, see Section 8.2.
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