L-Acoustics ARCS II - Line source with low-frequency element

ARCSII_UM_EN_3.0
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3.2 Line source with low-frequency element
In this configuration, an ARCS
®
II line source deployed with SB28 subwoofers, the system bandwidth is extended in the
low end.
The [ARCS II] preset allows for a reference frequency response in medium throw applications.
The [SB28_60] preset provides the subwoofer enclosures with an upper frequency limit at 60 Hz for an optimal frequency
coupling with the ARCS
®
II line source.
This configuration is driven by the LA4X (only for ARCS
®
II enclosures) or LA8 amplified controller.
ARCS
®
II line source + SB28
Horizontal array
(40°up/ 20°down)
stacked on SB28
Flown horizontal array
(40°down/20°up)
with ground-stacked SB28
Flown vertical array
(40°right/20°left)
with ground-stacked SB28
Enclosure
[PRESET]
Recommended ratios
ARCS
®
II
 [ARCS II]
1 SB28 : 2 ARCS
®
II
or
2 SB28 : 3 ARCS
®
II
SB28
 [SB28_60]
Frequency range (-10 dB)
Directivity pattern
25 Hz – 20 kHz
Asymmetrical 40°/20°
40° toward connector side
Pre-alignment values
[ARCS_II] + [SB28_60]
ARCS II = 0
SB28 = 2.6
[ARCS_II] + [SB28_60_C]
ARCS II = 2.9
SB28 = 0
Use [SB28_60_C] with an SB28 subwoofer array in cardioid configuration
The cardioid configuration consists in reversing 1 element in an array of 4 subwoofers.
Refer to the SB28 user manual for details about the CARDIOID configuration.