L-Acoustics V-DOSC, Operator'S Manual

Page: 53 / 158

L-ACOUSTICS V-DOSC Manual Version 4 6/29/2005 Page 53 of 158
LO/HI PRESETS
V-DOSC presets come in pairs (LO = smooth, HI = bright) and there is a 3 dB difference in HF
shelving eq between LO and HI presets. In addition to the HF shelving eq difference, for V-DOSC V7
LO presets, the mid/high section output gains have been scaled up by 2 dB in order to: provide a
flatter overall response curve for classical music and speech reinforcement; maximize A-weighted SPL
output; obtain a better utilization of available power resources; optimize LO and HI presets for their
target applications, i.e., LO = speech, classical music or proximity use and HI = rock / electronic
music, long throw applications.
Figure 35: Spectral balance for SUB/LOW versus MID/HI Sections
Note: For LO presets, to obtain the spectral balance that was provided in V6 presets (and earlier),
simply reduce the mid/high section output gains by 2 dB (to -5 dB / -5 dB)
Figure 36: Spectral balance for SUB/LOW versus MID/HI Sections (V6 presets and earlier)
3-WAY STEREO PRESETS
3WX PRESET
The 3WX preset features a 30 Hz high pass filter for the V-DOSC low section combined with
optimized low frequency shelving equalization. With the 3WX preset, significant LF energy can be
obtained from V-DOSC itself and for some applications (classical music or speech reinforcement), V-
DOSC can be used without additional subwoofers. For larger systems, there is the added benefit of
improved low frequency pattern control since the larger the V-DOSC array, the lower in frequency
that pattern control extends.
The 3WX preset is intended for standalone applications without subwoofers or for AUX SUB drive
using the SB218 DELAY ARC 80 Hz or SB218 LCR 80 Hz presets (subs with inverted polarity).
3W INFRA PRESET
The 3W INFRA preset features a 60 Hz HPF for the V-DOSC low section along with optimized low
section shelving equalization. Compared with the 3WX preset, 60 Hz high pass filtering provides
additional over-excursion protection for the V-DOSC low section.
The 3W INFRA preset is intended for standalone applications without subwoofers or for AUX SUB
drive using the SB218 DELAY ARC 60 Hz or SB218 LCR 60 Hz presets (subs with positive polarity).