X-Array™ Loudspeaker Systems
badge is right side up, maintaining a consistent
appearance. In addition the high-frequency horn
may be rotated, offering the choice of a 60°H x
40°V pattern or a 40°H x 60°V pattern.
All of the half-size X-Array™ models – the Xcn,
and Xcb – also have identical dimensions and ap-
pearance with grilles on, and have rigging that is
identical to the full-size models. The Xcb is acous-
tically symmetrical side to side and top to bottom
and, therefore, does not need to be rotated up-
side down for any reason when designing arrays.
The Xcn, however, is not acoustically symmetrical
top to bottom (the high-frequency horn is offset
slightly to one end inside the mid-bass horn),
which may necessitate that some enclosures be
turned upside down for optimal array perfor-
mance. The Xcn is shipped from the factory with
the high-frequency horn offset towards the bot-
tom. If the enclosure is turned upside down so
that the high-frequency horn is at the top, the
alignment feet on the enclosure must be swapped
around so that the male feet (protruding feet) are
on the bottom and the female feet (concave
dishes) are on the top as arrayed. The grille
should also be rotated so that the grille badge is
right side up, maintaining a consistent appear-
ance. In addition the high-frequency horn may be
rotated, offering the choice of a 60°H x 40°V pat-
tern or a 40°H x 60°V pattern.
2.2 Adjusting the Vertical Angles
Using the Xrsl (long wire-ropr rigging strap)
Between Enclosures: The long Xrsl rigging
straps are the primary recommendation for setting
the angle between enclosures because they pro-
vide the widest range between a pair of enclo-
sures.
Figure 9a
shows the round cutouts (or
“holes”) in the front rigging tracks of a pair of en-
closures, each numbered 0 through 5. These
twelve positions allow a range of angles between
enclosures from 0° (enclosures parallel to each
other) to 18°down in 1.8° increments. For in-
stance, when the fittings of the Xrsl rigging straps
are inserted into cutouts #0 on both the upper
and lower enclosures (position “0-0”), as shown in
Figure 9b
, the resulting angle between the two en-
closures is 0°. Notice in
Figure 9b
that the rigging
strap and fittings cover up all of the track cutouts
so that there are no round cutouts (or “holes”)
showing. Thus, the “0-0” position can also be
thought of as the “0-holes-showing” position. An
equation can be written that predicts the relative
angle of the enclosures when the Xrsl is used:
Angle = - (Holes Showing) x 1.8°
for the Xrsl
where negative (“-”) angles indicate down-
ward angles and positive (“+”) angles indicate
upward angles.
If the double-stud fittings of the Xrsl strap are in-
serted into cutout #3 in the upper enclosure and
cutout #4 in the lower enclosure (position “3-4”),
as shown in
Figure 9c
, a total of 7 holes are show-
ing, making the angle between the two enclosures
-(7 x 1.8°) = -12.6°. This system makes it easy to
obtain the desired vertical array shape without
having to experiment with balancing the enclo-
sures.
Using the Xrsl (long wire-rope rigging strap) at
the Grid: The long Xrsl rigging straps may also
be used to attach the top enclosure in an array
column to the ATM Fly-Ware
TM
MEGS-4000-T
grid. The Xrsl rigging straps allow the top enclo-
sure to hang at 0° (parallel to the grid) to 10.8°
down relative to the grid in 1.8° increments.
Figure 10a
shows the two cutouts in the track on
the front of the ATM grid, numbered 0 and 1, and
the six cutouts in the enclosure track, numbered
0 through 5. The same equation discussed in the
previous paragraph for determining angles be-
tween enclosures also applies to the Xrsl when
determining angles between the top enclosure
and the ATM grid:
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