C) General Description Of Dv-Dosc Presets - L-Acoustics dV-DOSC Operator's Manual

The bottom line is that making sure that dV-DOSC is used properly is in everyone's best interest
and it is up to the Qualified V-DOSC Technician and Certified V-DOSC Engineer to maintain quality
control standards. Quality control starts with good sound design, proper array design, accurate
installation, correct preset selection and a solid methodology for system tuning. Restricting access to
presets is in no way meant to restrict the creative process – on the contrary, the overall systems
approach is intended to enhance it by ensuring quality control and repeatability.
In practice, all OEM presets are distributed to end users via PCMCIA Card or are downloadable
from www.l-acoustics.com so that the presets remain software protected. Presets and preset
updates are available directly from L-ACOUSTICS headquarters in France or from Cox Audio
Engineering in the U.S. L-ACOUSTICS maintains a library of stock presets for both XTA and BSS
processors to support approved amplifiers for a variety of operating modes and cabinet
combinations. Custom presets are available on a special order basis and there is a standard price per
preset in order to cover custom engineering costs.

c) General Description of dV-DOSC Presets

Similar to V-DOSC, dV-DOSC presets are provided in LO and HI versions with differing amounts of
HF shelving equalization. In general, LO presets are flat (smooth) while HI presets have an additional
3 dB of shelving eq (bright).
2-way dV-DOSC stereo presets offer the choice between two high pass filters for the low section
and two shelving eqs for the high section. For dV-DOSC 2W 100 (XTA) or DV2W (BSS) presets, a
100 Hz, 24 dB/octave slope HPF is applied to the low section and the limit threshold is set at +7
dBu. For dV-DOSC 2W 75 (XTA) or DV2WX (BSS) presets, a 75 Hz 12 dB/octave slope HPF is
applied to the low section and the limit threshold is set at +5 dBu. For either of these presets, LO
(smooth) or HI (bright) versions are provided with differing amounts of shelving eq for the high
frequency section.
For V-DOSC plus dV-DOSC presets (for example, V-DOSC+dV X LO/HI or V-DOSC + dV 4W
LO/HI for XTA; VD DV X LO/HI or VD DV 4W LO/HI for BSS), dV-DOSC is preattenuated by 4 dB
for downfill applications where dV-DOSC is flown underneath V-DOSC. dV-DOSC high pass filtering
is set at 100 Hz and LO or HI shelving eq corresponds to the equivalent shelving eq that is applied to
V-DOSC. For BSS processors, dV-DOSC downfill enclosures can be driven with the same signal as
the main V-DOSC arrays by selecting source input A (instead of B as is standard). For the XTA
DP226, a fixed 4+2 configuration is used so that V-DOSC is driven off input A and dV-DOSC off
input B (an input Y adapter, i.e., 1x female XLR to 2x male XLR, can be used to apply the same
signal to both A and B channels to simplify console output matrix routing).
Note: For V-DOSC presets that include dV-DOSC processing, if dV-DOSC is used with V-DOSC for upfill
applications or as a separate fill array, the 4 dB preattenuation that is built in to the V-DOSC + dV-DOSC
presets for downfill applications may not be desirable and should be accounted for by varying the B input
gain or the dV-DOSC LF and HF section output gains.
Note: For 4+2 XTA configurations where V-DOSC is driven off input A and dV-DOSC off input B, if you
apply predelay to the V-DOSC arrays, make sure you apply the same predelay to the dV-DOSC arrays when
dV-DOSC is used for downfill.
3-way presets are provided for dV-DOSC plus dV-SUB with a variety of crossover points available
between dV-SUB and the dV-DOSC low section (80, 120 and 200 Hz). The 80 Hz crossover point is
intended for applications where dV-SUB and dV-DOSC are physically separated (eg. ground stacked
subwoofers with flown dV-DOSC system). The 120 Hz crossover point is considered optimal in
terms of power bandwidth for both dV-SUB and the dV-DOSC low section. The 200 Hz crossover
point allows the dV-SUB to function as a combination sub/low enclosure and also provides an
operating bandwidth that corresponds to that of the V-DOSC low section.
Note: For a ratio of 3:1 dV-DOSC:dV-SUB low frequency extension is provided that results in the same
spectral balance as V-DOSC (without subwoofers). For additional low frequency impact, a 1.5:1 dV-
DOSC:dV-SUB ratio is recommended (eg; 3:2, 6:4, 9:6, 12:8).
dV-DOSC dV-SUB Manual V2.0 Nov 2001 39