L-ACOUSTICS ARCS Manual V2.0
2/13/2003
10
1.2 ARCS SPECIFICATIONS
ARCS is a 22.5° trapezoidal enclosure designed for tightly-wrapped, fan-shaped horizontal arraying.
Internal components include a weatherproof 15" loudspeaker (3'' voice coil) plus a 1.4" exit (3" voice
coil) high frequency compression driver. The 15" loudspeaker is direct-radiating, bass reflex loaded,
while the compression driver is loaded by a custom DOSC waveguide that generates a pre-curved,
rectangular wavefront according to Wavefront Sculpture Technology criteria. The exit of the DOSC
waveguide is then loaded by a cylindrical lens that provides an asymmetrical vertical coverage angle of
+40°, -20°. The HF DOSC waveguide itself is constructed of injection molded polyurethane and is
acoustically resonant-free.
The ARCS enclosure is constructed of 18 mm Baltic birch plywood and all joints are rabbeted,
screwed and glued. The front dolly is of the same construction and is contoured to secure and protect
ARCS during transportation. The structured high resiliency paint employed provides excellent scratch
resistance for a long-lasting appearance. The color is maroon-gray and touchup paint is available for
maintenance purposes.
Internal steel bracing guarantees both flying security and long-term reliability of the cabinets under the
most demanding of touring conditions. Coupling rails are bolted to internal bracing and are vertically
connected to each other by internal steel bars. Two recessed handles are fitted on the top and
bottom of the enclosure to facilitate handling.
A black powder coated 1.5 mm (0.06 in) thick steel grille protects the speakers. The grille is covered
with open cell, acoustically transparent foam. The L-ACOUSTICS logo on the front of the grille
indicates the location of the 15'' loudspeaker.
All speaker components are installed in the enclosure using industrial strength screws and "Big Head"
type nuts (allowing repeated mount/dismount of components without the problems of traditional "T"
nut spinning). All fasteners and external components are either stainless steel or treated against
corrosion.
Dimensions:
Height x Front Width x Rear Width x Depth
820 x 440 x 190 x 652 mm
(32.3 x 17.3 x 7.5 x 25.7 in)
Net Weight:
57 kg (125.7 lbs)
Directivity:
22.5 degrees horizontal
+40, -20 degrees vertical
Connectors:
2 x 4-pin Neutrik NL4 Speakon
Figure 5: ARCS Enclosure
Summary of Contents for ARCS
Page 1: ...Version 2 February 2003 L ACOUSTICS ARCS OPERATOR MANUAL ...
Page 9: ...L ACOUSTICS ARCS Manual V2 0 2 13 2003 8 Figure 3 ARCS System Block Diagram ...
Page 48: ...L ACOUSTICS ARCS Manual V2 0 13 02 03 47 Table 13 ARCS Rigging Reference Chart ...
Page 52: ...L ACOUSTICS ARCS Manual V2 0 13 02 03 51 Figure 26 ARCS line drawing ...
