L-Acoustics V-DOSC, Operator'S Manual

Page: 57 / 158

L-ACOUSTICS V-DOSC Manual Version 4 6/29/2005 Page 57 of 158
5-WAY PRESETS
To enhance low end impact of the flown V-DOSC system, dV-SUB subwoofers can be flown beside
V-DOSC (with minimum physical separation) and used in conjunction with ground-stacked SB218
subwoofers to create a 5-way system. The dV-SUBs are run over the same operating bandwidth as
the V-DOSC low section and two preset types exist (X, INFRA).
5W INFRA PRESET
The 5W INFRA preset features identical operating bandwidths for the V-DOSC low section and dV-
SUBs (60 – 200 Hz) while ground stacked SB218s are crossed over at 60 Hz in INFRA mode (25-60
Hz). Given the optimized V-DOSC LF shelving eq plus the additional contribution of the dV-SUBs, the
impact of the flown system is significantly enhanced.
The 5W INFRA preset is intended for configurations where SB218s are ground stacked and dV-SUBs
are flown beside V-DOSC in a closely coupled configuration.
For the 5W INFRA preset, AUX SUB drive can be implemented using the SB218 DELAY ARC 60 Hz
or SB218 LCR 60 Hz presets (subs with positive polarity).
5W INFRA PRESET: Align SB218 peak1/dip2/peak2 with dV-SUB + V-DOSC low section
Figure 41: 5W Infra preset time alignment procedure
5W X PRESET
The 5W X preset features identical operating bandwidths for the V-DOSC low section and dV-SUBs
(30 – 200 Hz) while ground stacked SB218s are run from 25-80 Hz with negative polarity to account
for the phase shift due to the overlap in operating bandwidths. Given the optimized V-DOSC LF
shelving equalization plus the additional contribution of flown dV-SUBs, the sub/low output of the
flown system is maximized.
The 5W X preset is intended for configurations where SB218s are ground stacked and dV-SUBs are
flown beside V-DOSC in a closely coupled configuration.
For the 5W X preset, AUX SUB drive can be implemented using the SB218 DELAY ARC 80 Hz or
SB218 LCR 80 Hz presets (subs with negative polarity).
5W X: Align SB218 dip1/peak1/dip2 with dV-SUB+V-DOSC low section (SB218: -ve polarity)
Figure 42: 5W X preset time alignment procedure