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SB118
Subwoofer Enclosure
USER MANUAL
VERSION 1.1
7
OPERATION
7.1
System configuration
The choice of a system configuration should be the result of an electro-acoustic study conducted by an expert (System
Engineer or Audio Consultant). However, this will not be detailed here as sound-design aspects are beyond the scope
of this manual. This study can rely on the simulations modeled in SOUNDVISION software, yielding electro-acoustic
predictions which take into account the enclosures' manufacturer data and particular situational usage, as well as the
projected environment.
Several operation modes are for building all the common configurations (L/R, L/C/R, distributed), and each mode is
associated with a set of factory presets. Other non-conforming configurations do not correspond to any preset.
When L-ACOUSTICS
®
SB118 subwoofer enclosure is intended to extend the low frequency response of a main
system the user can choose between the ''STANDARD'' and ''CARDIOÏD'' operation modes. The ''MONO HYBRID''
or ''STEREO HYBRID'' operation modes allow the SB118 to extend the low frequency response of ARCS
enclosures, respectively.
Note: In "HYBRID" operation modes both SB118 and ARCS
controller thus limiting the number of required units.
!
The LA8 output channel assignment varies with the preset selected by the user. Always check that
each SB118 enclosure is connected to the correct output channel before operating.
IMPORTANT
Note: The latest version of the preset library can be supplied by an L-ACOUSTICS
also downloadable on the L-ACOUSTICS
7.2
"STANDARD" mode
In ''STANDARD'' mode the SB118 enclosures extend the low frequency response of the system in use down to 32Hz.
Each SB118 enclosure generates an omni-directional coverage pattern.
The corresponding presets are available in both LA4 and LA8 libraries.
7.2.1
Connecting the SB118 to the LA4 or LA8
Each of the SB118 enclosures is connected to an LA4 or LA8 output channel ranging from channel 1 through 4. On the
LA8 only, additional cabinets can be grouped in pairs in parallel with the first ones. Therefore a single LA4 amplified
controller can drive up to four SB118 enclosures (Figure 6), and a single LA8 amplified controller can drive up to eight
SB118 enclosures (Figure 7).
Any additional SB118 enclosure beyond 4 for the LA4 (or 8 for the LA8) needs to be connected to an additional
amplified controller following the same wiring procedures. Therefore, each group of 4 additional SB118 requires the
use of a new LA4 amplified controller while each group of 8 additional SB118 requires the use of a new LA8 amplified
controller.
Note: System resources are optimized for a multiple of four SB118 enclosures.
SB118_UM_ML_1.1
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®
®
internet website @ www.l-acoustics.com.
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or XT enclosures are driven from the same amplified
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authorized representative and is
®
and XT
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