L-Acoustics V-DOSC, Operator'S Manual

Page: 56 / 158

L-ACOUSTICS V-DOSC Manual Version 4 6/29/2005 Page 56 of 158
X PRESET
The X preset features the same operating bandwidth for SB218 subwoofers and the V-DOSC low
section (SB218 = 25-200 Hz, V-DOSC low = 30-200 Hz). X presets take full advantage of the
available power resources of the V-DOSC low section and are intended for closely coupled
applications where SB218 subwoofers are installed in close physical proximity to V-DOSC (flown
beside or stacked directly underneath as an extension of the system). The X preset optimizes the
overall sub/low output of the system and provides the best repartition of resources between sub, low
and high sections.
The X preset is intended for closely coupled sub V-DOSC configurations (minimum physical
separation).
AUX SUB drive can be implemented using Input B / Output 6 (see also X AUX below) or by using the
SB218 DELAY ARC 80 Hz or SB218 LCR 80 Hz presets (subs with negative polarity).
X PRESET: Align SB218 dip1/peak 2 with V-DOSC low section
Figure 39: X preset time alignment procedure
X AUX PRESET
The X AUX preset extends the V-DOSC low section down to 30 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 (SB218 = 25-80 Hz with negative polarity, V-DOSC low = 30-200 Hz). The
X AUX preset takes full advantage of V-DOSC low section resources and can be implemented using
Input B / Output 6 for the standard X preset.
Note: for 4+2 configurations (V-DOSC + ARCS or dV-DOSC), separate X AUX presets are provided for
XTA and LAKE digital signal processors to allow for aux sub drive.
The X AUX preset is intended for applications where SB218 subwoofers are ground stacked and
physically separate from the flown V-DOSC.
AUX SUB drive can also be implemented using the SB218 DELAY ARC 80 Hz or SB218 LCR 80 Hz
presets (subs with negative polarity).
X AUX PRESET: Align SB218 peak1/dip2 with V-DOSC low section (SB218: –ve polarity)
Figure 40: X AUX preset time alignment procedure