Stacking On Top Of Sb218 Subwoofers - L-Acoustics dV-DOSC Operator's Manual

Stacking on top of SB218 Subwoofers

For this application, four circular pads are provided on dV-BUMP that mate with the stacking runner
recesses on the top panel of the SB218 subwoofer. Side notches in dV-BUMP are also available that
allow a ratchet strap to be used to secure dV-BUMP to the SB218 for added stability.
Start by building a stack of SB218 subwoofers. From ground level, stacking at least four SB218
enclosures high puts dV-DOSC at a good height so that the bottom cabinet will be angled down into
the audience. Before stacking dV-DOSC, secure SB218 cabinets together using V-DOSC ANGLE
straps between cabinets (and/or a ratchet strap running around the entire stack). Physically securing
SB218s will provide extra stability during the dV-DOSC stacking procedure and will also prevent subs
from ''walking'' during the show.
Place dV-BUMP into position on top of the upper SB218 by mating the pads with the stacking runner
recesses. Attach two double stud to ring fittings in the fly track sections on the sides of the SB218.
Run a ratchet strap between these fittings through the side notches on dV-BUMP to secure dV-
BUMP to the top subwoofer. Tighten the ratchet strap securely but do not overtighten to the extent
that flytrack sections or double stud fittings are damaged. Alternatively, a ratchet strap can be run
around the entire subwoofer stack, including the dV-BUMP.
Pre-attach two dV-ANGLE bars at the rear points on dV-BUMP and select the desired tilt angle
downwards. Note: dV-ANGLE N bars can be selected if greater than 3.75 degrees downwards tilt is
required (this is provided by the 0 degree hole position on the dV-ANGLE P1 bar - note that the site
angle is referenced perpendicular to the front of dV-DOSC and not the trap angle of the enclosure).
Orienting the first dV-DOSC enclosure with the rigging tabs down (grille logo in the correct
orientation), place the 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.
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. Note: As a reference for ANGLE bar orientation, the ball end of
the angle bar should always be facing outwards.
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 posts 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.
dV-DOSC dV-SUB Manual V2.0 Nov 2001 80