X-Array™ Loudspeaker Systems
7. When using pull-up lines, never pull up
enough to allow the chains to go slack on
the rear Xrhg grid hinges or Xrhp pickup
hinges.
8. When using a grid, always make sure that
the grid is balanced and hangs level ±5°.
9. Only use New Haven NH32102-2 double-
stud swivel-ring fittings on the Xrss rigging
straps, Xrsl rigging straps or any custom
rigging straps.
10. Only use Xrhl linking hinges, Xrhg grid
hinges, or Xrhp pickup hinges manufac-
tured by Electro-Voice.
Discussion of Array Examples: As an example,
if the top enclosure in a column was angled down
10°, the enclosure working-load-versus-angle limit
from the simplified structural-rating guidelines
shown in
Figure 19
would indicate that a total of
726 kg (1,600 lb) could be safely suspended –
including the weight of the top enclosure plus all
of the enclosures and rigging suspended below.
If, however, the top enclosure in a column was
angled up 10°, the total allowable weight would
then only be 499 kg (1,100 lb) – including the
weight of the top enclosure plus all of the enclo-
sures and rigging suspended below. The enclo-
sure working-load-versus-angle limit shown in
Figure 19
not only applies to the top enclosure in
an array column, but also applies to every enclo-
sure in an array column. In arrays where a pull-up
line is not used, the top enclosure is always the
limiting factor because it supports the most
weight. However, in arrays where a pull-up line is
used to achieve substantial downward angles, it is
possible that a lower enclosure could be the limit-
ing factor.
3.4 Complex Structural-Rating Analysis
For a complete structural-rating analysis, the
forces in each individual piece of rigging hard-
ware throughout the X-Array™ system must be
determined, as well as the forces on each enclo-
sure. Determining these forces requires complex
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