L-Acoustics dV-DOSC Operator's Manual page 109

fact that all fronts are pinned together and can pivot, plus all rear angles were pre-attached in the
previous step.
Pre-connect the rear point only for the first dV-DOSC to the dV-SUB, i.e., use 2 x dV-PIN25 to
secure dV-DOSC to the dV-ANGLESDP that was pre-attached at the (bottom) rear of dV-SUB
Note : Selecting the 0 degree angle on dV-ANGLESDP (between the rear of the top dV-DOSC enclosure and
dV-SUB) is necessary to compensate for the 3.75 degree trapezoidal angle of dV-DOSC versus the actual
site angle of the enclosure which is perpendicular to the front. Selecting the 0 degree angle allows focus to
be verified visually or with a laser attached to the bottom of dV-SUB since this will then be referenced to
the actual site angle of the top dV-DOSC element.
Connect all elements to the AMP RACKS using appropriate cables and adaptors (SP and DO2W or
DO plus DOFILL) and SP.7 jumpers between elements for parallel operation. Long cable runs should
be dressed and tied off to dV-BUMP for strain relief. Be careful not to connect more than 3 dV-
DOSC enclosures in parallel.
Conduct a final inspection to make sure all cabling is correct, proper interelement angles have been
selected and that all dV-PINs are in place and securely seated.
Connect the front and rear motors (or single motor) to dV-BUMP.
Slowly begin to raise the array. As the array lifts off, there will be a gap between the dV-SUB and
dV-DOSC. One person on either side can lift/rotate the block of 3 dV-DOSC into position and then
secure the front attachment points to dV-ANGLESD using 2 x dV-PIN25.
Be careful to steady the array as it lifts off the ground in order to prevent it from swinging. Gradually
lift the array until it is freely floating in air. If you are doing a single point hang, use a digital
inclinometer to verify that the tilt angle of the top element is correct before taking the array up to
trim. If adjustment is required, lower the array and change the pick point until the desired tilt is
obtained.
dV-BUMP Hole #
(0=front, 16=rear)
dV-DOSC dV-SUB Manual V2.0
Table 15: EXAMPLE PICK POINT REFERENCE CHART
(1 dV-SUB, 3 dV-DOSC, 7.5 deg between all dV-DOSC)
1-> 8 = center
9 -> 16 = ext bar
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
dV-BUMP Site Angle
(= top dV-DOSC site angle
provided 3.75 deg selected between
top dV-DOSC and dV-SUB)
+14.7 deg
+11.1 deg
+7.7 deg
+3.7 deg
+0.5 deg
-4.5 deg
-8.25 deg
-11.9 deg
-20.8 deg
-24.0 deg
-27.2 deg
-30.3 deg
-33.1 deg
-35.7 deg
-38.2 deg
-40.6 deg
Nov 2001 109