Care And Maintenance; Maintenance Information; Testing Procedure; Check Of Transducer And Enclosure Acoustic Behavior - L-Acoustics SB118 Manuel D'utilisation

SB118 SB118
SB118 SB118
S S S S UBWOOFER UBWOOFER E E E ENCLOSURE UBWOOFER UBWOOFER
USER MANUAL USER MANUAL
USER MANUAL USER MANUAL
VERSION 2.0
8 8 8 8

CARE AND MAINTENANCE

CARE AND MAINTENANCE CARE AND MAINTENANCE CARE AND MAINTENANCE
8.1

Maintenance information

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The L-ACOUSTICS SB118 enclosure is a technical product designed for various, intensive indoor and outdoor
sound reinforcement applications. To fulfill such demanding conditions L-ACOUSTICS
enclosure with high-grade and reliable components:
•
Weather-resistant transducers.
•
Baltic birch plywood cabinet.
•
Polyester-coated steel grill.
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Oxidation-resistant screws.
However, in order to ensure product performance and safety, it is essential to frequently inspect the SB118 cabinet and
its internal components. These checks need to be done on a regular basis depending on the conditions of system use.
The testing procedure consists of three steps as described in section 8.2. If the speaker needs to be repaired or
replaced follow the procedure described in section 8.3.
8.2

Testing procedure

8.2.1

Check of transducer and enclosure acoustic behavior

Connect a sweep frequency generator to the active input of the amplified controller. Apply a sweep from 32 to 100 Hz
with a maximum voltage of 0.5 volts (-4 dBu, -6 dBV): the sound should remain pure and free of any unwanted noise.
If not, check the mechanical assemblies and, if necessary, contact an L-ACOUSTICS
repair or replace the damaged components (see also section 8.3).
!
0.5 volts is a maximum value that can generate very high sound levels at given frequencies.
Use ear protection to set the sound level before testing.
WARNING
Whenever a loudspeaker is reconnected, wiring polarity should be checked using a phase checking device. If a
transducer is out of phase, invert the cables connected to its electrical sockets. The connecting procedures are given in
section 8.3.

8.2.2 Check of mechanical assembly and rigging parts

Inspect the general aspect of assembly and check that screws are locked tight (on stacking runners, front locator studs,
handles, pole-mount socket, loudspeaker, grill, and front bass-reflex panel). Check the quality of contact and locking
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action of the Speakon sockets. Also check the integrity of rigging elements (no signs of deformation, fissure, or
corrosion). If necessary, contact an L-ACOUSTICS
8.2.3

Check of external aspect

Remove the dust from the grill with a vacuum device. If needed, repaint the cabinet.
!
If paint is applied, protect the mechanical parts.
IMPORTANT
SB118_UM_ML_2.0
NCLOSURE NCLOSURE NCLOSURE
®
authorized representative to replace the damaged components.
w w w . l - a c o u s t i c s . c o m
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has designed the SB118
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authorized representative to
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