L-Acoustics V-DOSC, Operator'S Manual

Page: 49 / 158

L-ACOUSTICS V-DOSC Manual Version 4 6/29/2005 Page 49 of 158
1.10 CO24 CONTROL OUTPUT PANEL
Figure 32: CO24 Control Output Panel
The CO24 control output panel can be used in conjunction with 4 digital signal processors to create a
compact, modular drive rack. DSP outputs are patched to the 24 x female XLR patch bay on the
internal side of the CO24 panel and are then assigned to MC28100 MULTI return snake lines. For
added flexibility, all MULTI lines are paralleled with individual front panel Left-Left (A), Left (B), Right
(C) and Right-Right (D) 19-pin CA-COM connectors.
These individual CA-COM connectors can be used in situations where the drive rack is located
onstage (eliminating the need for a MULTI DISTRO panel) or when it is desirable to run separate
drive snakes to remotely-located amplifier racks. For example, in some cases, amplifier racks may be
located at delay towers behind the FOH location and separate snake runs required, or for smaller
club/theatre shows, two DOM30 Cross Link cables can be run for left and right arrays instead of using
the MC28100 MULTI. In addition, the availability of individual CA-COM connectors allows a DOMM
LINK BREAKOUT cable to be connected to these outputs for testing purposes.
The CO24 control output panel configuration allows for maximum flexibility while providing a
scaleable architecture that can be used for small, medium and large systems. Let’s consider the largest
system application in detail since small and medium systems will adhere to the same channel
assignment standards and are considered as subsets of the large scale setup.
A large scale V-DOSC system typically consists of: Left-Left (L-L), Left (L), Right (R) and Right-Right
(R-R) V-DOSC arrays. Each of the four arrays can have associated 2-way dV-DOSC downfill
enclosures and SB218 subwoofers. Therefore, each L-L, L, R and R-R array requires 6 drive channels:
3 for V-DOSC, 2 for dV-DOSC and 1 for SB218s. Since there are 4 arrays, this requires 24 drive
channels total. The 84 pin Whirlwind MASS W6 connector accomodates these 24 drive channels (72
lines) leaving 14 additional lines available.
It is important to have discrete drive for all four arrays for several reasons: (a) Discrete drive allows
for the relative time alignment of all 4 arrays, i.e., typically the L array will act as a time reference for
the L-L array while the R array acts as a time reference for the R-R; (b) Different-sized arrays will
require different band attenuation and equalization, i.e., typically the L-L and R-R arrays used for
offstage coverage are smaller in terms of the number of enclosures; (c) Discrete drive for all four
arrays allows for the creation of stereo over larger audience areas, i.e., using the console's matrix
outputs the stereo left signal can be applied to the L and R-R arrays while stereo right can be sent to
the R and L-L arrays. De-correlating the L-L versus L signals (and R-R versus R) by applying stereo
feeds also helps to reduce the effects of audible interference in the coverage overlap region between
main FOH and offstage fill arrays.