Safety Rules - L-Acoustics dV-DOSC Operator's Manual

Note: As a reference for ANGLE bar orientation, the ball end of the angle bar should always be facing
outwards (even when attaching to the dV-BUMP).
Place the second dV-DOSC on top of the bottom enclosure by mating the two front rigging posts on
the second element and the dV-ANGLE bars that were previously mounted on the bottom element
with the available locator slots. Attach the two front points using two dV-PIN25 to secure the
second dV-DOSC element's front rigging tabs to the bottom element. Tilt the rear of the second
enclosure to the desired angle and attach the second dV-DOSC to dV-ANGLE using two dV-PIN25.
The same procedures are followed for all other dV-DOSC elements of the array until stacking is
completed.
The correct angle for the entire array is then obtained by fine adjustment of the dV-BUMP
screwjacks. Focus of the top element can be checked by sight from behind the array - but you must
compensate for the 3.75 degree trapezoidal angle of dV-DOSC since the wavefront is radiated
parallel to the front of the cabinet (not perpendicular to the trap angle).
As a sighting guide, attach a dV-ANGLE bar at 3.75 degrees at the rear of the top enclosure and a
second dV-ANGLE at 7.5 degrees at the front of the top enclosure. Visually lining up the tops of the
two dV-ANGLE bars provides a sighting guide that is perpendicular to the front of the top element.
Looking from the rear of the array and sighting along the two dV-ANGLE bars, the tilt of the array
should be aligned so as to cover the rearmost seats of the audience. Alternatively, from the highest
section of audience area, if you can see the upper wall of the top dV-DOSC element, you are
definitely out of the coverage pattern. More precise aiming can be accomplished by placing a laser
pointer or similar device on the upper wall of the top enclosure (and compensating for the 3.75
degree trap angle). A similar visual check should also be made with respect to the lower wall of the
bottom element of the array in order to ensure that the closest members of the audience are
covered.
Connection of the array to the AMP RACKS can be performed as soon as stacking is completed.
Remember to parallel a maximum of 3 dV-DOSC elements only.

Safety Rules

CAUTION: NO MORE THAN 12 dV-DOSC ELEMENTS SHOULD BE STACKED ON ONE
BUMPER. INSTABILITY CAN OCCUR EITHER WHEN TILTING THE ARRAY OR UNDER HARD
WIND CONDITIONS.
FOR STABILITY REASONS, THE dV-DOSC ARRAY MUST BE PHYSICALLY CONTAINED WITHIN
THE VERTICAL FOOTPRINT OF THE V-DOSC BUMPER.
Always test the strength of the supporting floor - for 12 elements each screwjack can produce up to
a 95.5 kg load (210 lbs). If necessary, use plywood sheets or steel plates under individual screwjack
feet in order to help distribute the load.
Verify that all dV-DOSC elements are securely interconnected with dV-PIN25.
For improved stability in outdoor situations, ratchet strap the dV-BUMP and V-DOSC BUMPER
assembly to the stacking platform whenever possible
dV-DOSC dV-SUB Manual V2.0 Nov 2001 72