Figure 1: Conventional Horn Array Versus An Array Of Arcs Dosc Waveguides; Figure 2: Array Of 4 Arcs Enclosures - L-Acoustics ARCS Operator's Manual

Figure 1: Conventional horn array versus an array of ARCS DOSC waveguides

ARCS is designed with a trapezoidal shape for lateral coupling of adjacent cabinets and enclosures are
mechanically joined to form a fan-shaped, tightly-wrapped array. To match the coverage of the
wavefront radiated by the DOSC waveguide, the angle of each enclosure is 22.5°.
At lower frequencies, the size of the ARCS enclosure allows for perfect coupling due to the size of
wavelengths below 800 Hz, i.e., the distance between acoustic centers of adjacent sources is always
less than half a wavelength over the entire low section operating bandwidth, thus satisfying WST
Condition #2.
The ARCS system therefore meets the conditions defined by Wavefront Sculpture Technology and
provides, when arrayed in any number, the equivalent of single loudspeaker behavior. The net result is
exceptionally even frequency response over the entire array coverage area – a feature which is
characteristic of Wavefront Sculpture Technology.
For optimizing the geometrical coverage of typical audiences, the vertical coverage of ARCS is not
symmetrical, but provides 40° in one direction and 20° in the opposite direction. The advantages
inherent in this geometry are further discussed throughout the course of this manual.
ARCS is the only medium format system that provides a coherent, single point source sound field. This
makes ARCS highly suitable for medium scale sound reinforcement applications where multiple sound
source designs are not powerful enough and, in terms of throw distance, the extreme capabilities of
V-DOSC are not required.
Figure 2: Array of 4 ARCS Enclosures providing 90 degree horizontal coverage
and +20/-40 degree vertical coverage (inverted orientation)
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L-ACOUSTICS ARCS Manual V2.0 2/13/2003