Installation Procedures; Stacked Systems; Stacking Dv-Dosc Standalone - L-Acoustics dV-DOSC Operator's Manual

4. INSTALLATION PROCEDURES

In the following sections, detailed installation procedures for stacking and flying dV-DOSC are
presented. Please follow these procedures carefully and at all times remain safety-conscious.

4.1 STACKED SYSTEMS

Stacking dV-DOSC Standalone

For stability reasons, the maximum number of dV-DOSC elements that can be stacked is 12. In this
case, each screwjack presents a load of 95 kg (210 lbs). The strength of the supporting floor should
be carefully examined to determine if such a load can be supported - sheets of plywood or steel
plates can be placed under individual screwjack feet in order to help distribute the load. For
improved stability and load distribution, the front two screwjacks can be omitted and the two rear
screwjacks only used for downwards tilt adjustment. For improved stability in outdoor situations,
ratchet strap the dV-BUMP and V-DOSC bumper assembly to the stacking platform whenever
possible.
Once the floor location for the stacked array has been determined, dV-BUMP is attached to the V-
DOSC BUMPER by mating the two locating studs on dV-BUMP with the corresponding holes on the
center cross bar section of the V-DOSC BUMPER (locating tabs are facing upwards so that dV-
BUMP sits inside the V-DOSC bumper). A steel stud and dV-PIN81quick release pin is then used to
mechanically secure dV-BUMP to the V-DOSC BUMPER at the central hole position along the front
of the entire assembly.
Aim the stacking platform in the correct direction to provide the desired amount of array rotation
on- or off-stage. Attach two screwjacks to the rear of the V-DOSC BUMPER by setting the height
adjustment blocks on the two screwjacks to the minimum position then sliding these blocks into the
locating slots on dV-BUMP (the front two screwjacks are optional when the array is to be tilted
downwards).
Referring to the simulation results obtained in ARRAY, the screwjacks are then adjusted to provide
the required vertical angle for the lowest element. NOTE: A digital inclinometer is useful for
performing angle measurements. If this is not available, visually sight down dV-BUMP to ensure that
the closest members of the audience will be covered.
In preparation to begin stacking, pre-attach dV-ANGLE P1 to the two rear mount points on dV-
BUMP. Select the 3.75 degree hole (middle position) and pin dV-ANGLE P1 into position using dV-
PIN25. As a reference, the ball end of dV-ANGLE P1 should always face outwards. By selecting the
3.75 degree hole, this sets dV-BUMP perpendicular to the face of the bottom cabinet and allows the
site angle of dV-BUMP to serve as an aiming reference for correct focus.
Orienting dV-DOSC with the rigging tabs down (i.e., grille logo in the correct orientation), place the
bottom enclosure on dV-BUMP by mating the front rigging tabs and rear locator slots with the
locator slots and rear dV-ANGLE bars that were previously attached to dV-BUMP. Attach all four
points using four dV-PIN25 (front first, rear last) to secure the bottom dV-DOSC to dV-BUMP.
Verify the tilt angle for the first element and perform any required tilt adjustments using the rear
screwjacks.
Note : Compensate for the 3.75 degree trapezoidal angle of dV-DOSC versus the actual site angle by using
a 3.75 degree angle between the rear of the bottom enclosure and dV-BUMP.
The next step is to connect two more dV-ANGLE bars to the rear locator slots of the bottom dV-
DOSC enclosure using two dV-PIN25. Pre-select the appropriate hole position to give the desired
tilt angle for the second enclosure.
dV-DOSC dV-SUB Manual V2.0 Nov 2001 71