L-ACOUSTICS V-DOSC Manual Version 4 6/29/2005 Page 33 of 158
1.2 V-DOSC SPECIFICATIONS
Figure 17: V-DOSC Enclosure - Front and Rear Views
V-DOSC is an active full range 3-way loudspeaker enclosure that satisfies WST conditions when
vertically arrayed. Each V-DOSC enclosure contains two direct radiating, bass reflex-loaded 15-inch
low frequency transducers, four bass reflex-loaded 7-inch midrange frequency transducers that are
mounted in a V-shaped acoustic lens configuration and two 1.4'' exit, titanium diaphragm compression
drivers that are coupled to individual, vertically-aligned DOSC waveguides. As a full range system, the
frequency response is 50 Hz to 18 kHz with less than ± 3 dB variation and the usable bandwidth is 40
Hz to 20 kHz (-10 dB).
The DOSC waveguide employed in V-DOSC generates a flat, isophase wavefront for the high
frequency section. When vertically-arrayed, multiple loudspeakers function according to the principles
of Wavefront Sculpture Technology with either the separation between acoustic centers of individual
sound sources less than the size of half the wavelength at the highest frequency of their operating
bandwidth (low and mid sections) or the sum of the individual areas of the isophasic radiating
elements is greater than 80 percent of the target radiating area (high section). All components of a V-
DOSC array are symmetrically arranged with respect to a plane vertically bisecting the array (coplanar
symmetry) and provide 90-degree horizontal coverage (-6 dB points) independent of the number of
vertically arrayed enclosures.
Crossover points are 200 Hz between low and midrange sections and 1.3 kHz between midrange and
high sections with 24 dB per octave Linkwitz-Riley characteristics. Long term RMS power handling is 2
x 375 Wrms, 600 Wrms and 200 Wrms for low, midrange and high sections, respectively. Low
frequency transducers are powered individually at a nominal 8-ohm impedance, midrange frequency
transducers are connected in series/parallel for an overall nominal 8-ohm impedance and high
frequency transducers are connected in series with a nominal 16-ohm impedance. All components are
weather-resistant and connection to the loudspeaker is made via two parallel 8-pin connectors.
Although V-DOSC is a 3-way design, the enclosure is powered by 4 amplifier channels. Enclosures are
connected to amplifier racks using V-CABLEs (7 m or 25 m length, as required) that are equipped
with 8 pin Cannon CA-COM connectors of the bayonet-locking type. Each V-DOSC enclosure is
Dimension (WxHxD): 1300mm x 434mm x 565mm
(51.2" x 17.1" x 22.2")
eight: 108 kg (238 lbs)
+ 9,5 kg (21 lbs) with dolly
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