L-ACOUSTICS ARCS Manual V2.0 2/13/2003 30
Figure 16: AUTOCAD utilities for representing ARCS horizontal and vertical coverage.
To summarize, an ARCS array should be aimed so as to geometrically cover the audience area it is
meant to cover with the main zero degree axis roughly orientated towards the middle of this area.
This is unlike conventional speaker systems which are typically aimed at the rearmost part of the
audience.
4.3 MONITOR SIDE-FILL
Due to its tight directivity pattern and compact size, ARCS is an excellent solution for flown or
stacked side-fill applications. The modular 22.5 degree horizontal coverage of ARCS is very practical in
determining the extension of the sound field onstage and, in most cases, the outside wall of the ARCS
enclosure that is furthest downstage is aligned parallel to the edge of the stage lip in order to prevent
spill from the side-fill system into the audience area. Due to this precise coverage and its excellent
feedback resistance, ARCS is one of the highest performance side-fill systems available.
Single or two enclosure ARCS arrays are the most common set-up for side-fill applications and ARCS
can be used with or without subwoofers depending on the amount of LF extension expected by the
monitor engineer or performing artist. When stacked on top of one or two horizontally-oriented
SB218 subwoofers, up to 4 ARCS can be used depending on horizontal coverage requirements. In the
horizontal orientation, 2 SB218s provide a good footprint for stacking up to 4 ARCS. The vertical
orientation for ARCS is in the normal position, with the 40° radiation pattern directed upwards (i.e.,
logo at the bottom).
SB218 subwoofers can also be used vertically (i.e., standing on their sides) in order to have ARCS side-
fill enclosures at a more convenient stacked height that is closer to the performer’s ear level. In the
vertical orientation, 2 SB218s provide a good footprint for stacking up to 3 ARCS.
Note: When ARCS is stacked on top of a 2 high horizontal stack of SB218 subwoofers, the overall height is
1.92 meters. When ARCS is stacked on top of SB218s oriented vertically, the overall height is 2.12 meters.
Note: It is recommended that ARCOUPL bars are used for all stacked installations in order to provide
improved physical stability of the stacked ARCS system.
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