L-Acoustics V-DOSC Line Array

L-Acoustics V-DOSC is an active full range 3-way loudspeaker enclosure that satisfies WST conditions when vertically arrayed. Each L-Acoustics 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 L-Acoustics 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 L-Acoustics 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 L-Acoustics 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 provided with two connector sockets for direct connection and for paralleling of up to three enclosures (using DO.7 V-CABLEs). The rectangular shape of the enclosure allows for easy stacking, transport and handling.

A front mounted dolly board is provided for protection and transportation. Stacking runners located on the bottom of the cabinet act as skid pads to protect the cabinet finish and mate with stacking runner recesses on the top of the enclosure for enhanced stability when stacking. Cabinet dimensions are 130 cm (51.2-in) wide, 43.4 cm (17.1-in) high, 56.5 cm (22.2-in) deep and were designed to allow for efficient truck packing for a variety of trailers of standard size.

Enclosure weight is 108 kg (238.1 lbs) and cabinet construction consists of 15 mm (0.59-in), 30 mm (1.18-in) Baltic birch plywood with internal steel bracing and joints that are sealed, screwed and rabbeted. The finish is maroon-gray, high-resilient paint and the front of the enclosure is protected by a black epoxy-coated, 1.5 mm (0.06- in) thick steel grille that is covered with 10 mm (0.4-in) thick acoustically-transparent open cell foam.

Flying a L-Acoustics V-DOSC array is easy, fast and secure. The L-Acoustics V-DOSC enclosure features a unique rigging system where built-in flying hardware extends from cabinet-to-cabinet to the hanging points on the BUMP2 flying structure in a train-like fashion. Two recessed Aeroquip flytrack sections are mounted on both sides of the enclosure and two rear-mounted rotating legs allow up to 16 V-DOSC to be assembled in a vertical column. Angle straps are attached between enclosures using the side flytrack sections to provide up to a maximum of 5.5 degrees between enclosures at 0.75 degree angular resolution.

Cabinets are physically connected while lined up on the floor and the complete array is flown all at once (in comparison with other systems where cabinets are flown row-by-row). The only external parts needed are ANGLE STRAPS and SPACER blocks – these accessories are used to adjust the angle between enclosures in the array (see Chapter 4 for details on flying and stacking V-DOSC). L-Acoustics V-DOSC is used with an approved digital signal processor with OEM factory presets for active 3-way, 4-way or 5-way operation in conjunction with additional SB218 or dV-SUB subwoofer enclosure