L-Acoustics dV-DOSC Operator's Manual page 93

Referring to the angle values that were pre-calculated for each element using ARRAY 2000, pre-
attach pairs of dV-ANGLE bars at the rear of all dV-DOSC elements of the array (while they are still
face down in their flight cases). Remember to keep the ball/tab end up and oriented towards the dV-
BUMP as a reference. Be careful to select the correct angle for each element (generally, it is better
if one person performs this operation to avoid mistakes). Note that pre-selecting angles will allow
the dV-ANGLE tab to act as a stop while the array is being lifted, facilitating attachment using dV-
PIN25.
Connect the rears of dV-DOSC elements in blocks of three (while they are still face down in their
flight cases) by pulling the cabinets together at the rear and inserting dV-PIN25. This operation is
facilitated by the fact that all fronts are pinned together and can pivot, plus all rear angles were pre-
attached in the previous step.
Connect all elements to the AMP RACKS using the 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-PIN25 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, the rear gaps between blocks of 3 cabinets will
close, allowing you to progressively pin the blocks together as system goes up.
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.
Attaching rear dV-ANGLE bars and shackles to the bottom element of the array then running a
ratchet strap up to the single point hang location can provide an additional degree of tilt adjustment
(down only) and also help to stabilize the array from spinning. The bottom two points can also be
used for attaching tie lines.
If you have 2 motors available, more detailed focus can be achieved by mounting a laser on top of
dV-BUMP (provided that you have used a 3.75 degree angle for the rear of the top element so that
dV-BUMP is parallel to the site angle).
Note: Since the rigging system for dV-DOSC is front pivoting, coordinates are referenced to the front of the
top element and the bottom element elevation is referenced to the front of the bottom element. This
means that when focussing a dV-DOSC array the front motor controls the trim height while the rear motor
controls tilt. This is opposite to the case for V-DOSC since the rigging system is rear-pivoting.
For demounting, lower the array and remove the front dV-PIN25 pins on the bottom three
elements. Roll a FLIGHT-dV case into position and land the three elements face down in the case.
Disconnect the rear dV-PINs of the third element and wheel the block of 3 out of the way for
further hardware de-installation. Repeat this procedure in groups of three at a time.
dV-DOSC dV-SUB Manual V2.0 Nov 2001 93