L-ACOUSTICS ARCS II [6/12] Arcs arcs arcs arc
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L-ACOUSTICS ARCS II [6/12] Arcs arcs arcs arc

L-ACOUSTICS ARCS II [6/12] Arcs arcs arcs arc
ARCS
ARCSARCS
ARCS
®
II
IIII
II
SYSTEM
SYSTEMSYSTEM
SYSTEM
USER
USERUSER
USER
MANUAL
MANUALMANUAL
MANUAL
VERSION 1.2
ARCSII_UM_E N_1-2
w w w . l - a c o u s t i c s . c o m
6
66
6
3
33
3 OPERATING MODES
OPERATING MODESOPERATING MODES
OPERATING MODES
3.1 FULL-RANGE mode
In FULL-RANGE mode, the ARCS
®
II system operates within the nominal bandwidth of the enclosure.
It corresponds to the use of the ARCS
®
II line source in standalone configuration, i.e. without complementary
subwoofers.
The ARCS
®
II enclosure is driven by the LA8 amplified controller with a dedicated factory preset.
Standalone ARCS
®
II line source
Horizontal array
(40°up/ 20°down)
Flown horizontal array
(40°down/20°up)
Flown vertical array
(40°right/20°left)
Enclosure
[
PRESET
]
®
II
[
ARCS II
]
Directivity pattern
Asymmetrical 40°/20°
40° towards connector side
Frequency range (-10dB)
50Hz – 20kHz
3.2
LOW-EXTENSION mode
In LOW-EXTENSION mode, the bandwidth of the ARCS
®
II system is extended in the low end.
It corresponds to the use of an ARCS
®
II line source in combination with the SB28 subwoofer.
Each enclosure type is driven by the LA8 amplified controller with a dedicated factory preset. The ARCS
®
II enclosure is
driven with the same preset as in standalone configuration. The SB28 subwoofer is driven with a preset featuring an
upper frequency limit at 60 Hz, in order to optimize the acoustic coupling with the line source.
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
Recommended ratios
1 SB28 : 2 ARCS
®
II
or
2 SB28 : 3 ARCS
®
II
Directivity pattern
Asymmetrical 40°/20°
40° towards connector side
Enc
losure
[
PRESET
]
®
II
SB28
[
ARCS II
]
[SB28_60]
Frequency range (-10dB)
25Hz – 20kHz
Delay settings
When combining a line source with subwoofers, delays may have to be added to the presets.
Refer to the LA8 PRESET LIBRARY user manual to obtain the pre-alignment delay values.
Use
[
SB
28
_
60
_C]
with a
n
SB
28
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 mode.

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