L-Acoustics ARCS Operator's Manual

Contents

L-Acoustics ARCS Operator's Manual Manual pdf 11 page image

L-ACOUSTICS ARCS Manual V2.0 2/13/2003 101.2 ARCS SPECIFICATIONSARCS 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" voicecoil) 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 DOSCwaveguide 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 isacoustically 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 protectARCS during transportation. The structured high resiliency paint employed provides excellent scratchresistance for a long-lasting appearance. The color is maroon-gray and touchup paint is available formaintenance purposes.Internal steel bracing guarantees both flying security and long-term reliability of the cabinets under themost demanding of touring conditions. Coupling rails are bolted to internal bracing and are verticallyconnected to each other by internal steel bars. Two recessed handles are fitted on the top andbottom 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 coveredwith open cell, acoustically transparent foam. The L-ACOUSTICS logo on the front of the grilleindicates 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 againstcorrosion.Dimensions:Height x Front Width x Rear Width x Depth820 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 verticalConnectors:2 x 4-pin Neutrik NL4 SpeakonFigure 5: ARCS Enclosure