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Ensuring Proper Array Assembly
If the top row's connections are secure and satisfactorily placed, the array can be lifted to a height off
the floor equal to the height of the next row of speakers on their wheels, about 56 inches (143 cm). This will be
easy to gauge since the speakers going into the next row are nearby. The pairs of Wheel Bars on the bottom of
each speaker slide out the back one at a time and at this working height of 5-1/2 feet (1.67 m), stage-hands do
not need to bend over. After removing the wheels from the hung row, the next row is simply rolled into place
beneath.
After the next row is positioned under the suspended row above it, it may be necessary to lower the
motors slightly. Again, be sure to call "about to move" to warn others whose hands or fingers may be in danger.
When the speakers are directly over each other, the Connecting Bars slide into the guide tracks on each side of
both speakers, one at a time, connecting them together. Insert the Quick Release Pins to secure the Connecting
Bars. Subsequent rows of speakers are connected in similar fashion.]
Lifting Bars (HLA-LB) and Connecting Bars (HLA-CB) are secured with quick release pins to ensure
that bars stay securely in the track. All quick release pins must be fully inserted for positive locking. A quick
release pin is attached to each Lifting or Connecting Bar with a wire cable to ensure they will be used together.
Missing or damaged quick release pins should be replaced before using the Bars.
The speaker cables, along with the control and power cable(s) to the motors should be secured in such
a way that their weight does not hang on their connectors. This is can be done by cinching a long nylon sling
around the back of the Truss module frame, wrapping it around all the cables twice and clipping it to itself with
a shackle or a carabiner.
If HLA speakers are suspended without the use of a Truss Module or similar suspension frame, care
must be taken to hang the speakers so that their weight does not compress the Spaceframe. When connecting
slings directly to the Lifting Bar without the Truss Module, bridles must be made front-to-back along the Lifting
Bar, as this only places compression on the rigid Lifting Bar and not on the Spaceframe.
As the array is being assembled, the chosen
Tilt Angles can be selected for each 4895 Three-Way
unit. Three positions are available...0°, 7.5°, and 15°.
The tiltable waveguide is one of the most
innovative aspects of the HLA system. It can be used to
assemble precision-configured arrays that ensure
smooth, even coverage to all parts of a listening area.
A precisely-aimed 60-degree vertical coverage
pattern can be obtained by tilting the waveguide on the
upper array unit to its maximum of +15°, aiming the
center 4895 unit straight ahead at 0°, and tilting the
waveguide on the bottom 4895 unit at -15°. Arrays with
varying coverage angles can be constructed by tilting
waveguides as required.
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