Maintenance Information; Testing Procedure; Acoustical Check; 8.2.2 Mechanical Check - Acoustics SB18 Manuel D'utilisation

SB18 8 8 8 SB1
SB1 SB1
COMPACT HIGH POWER SUBWOOFER COMPACT HIGH POWER SUBWOOFER COMPACT HIGH POWER SUBWOOFER COMPACT HIGH POWER SUBWOOFER
USER MANUAL USER MANUAL
USER MANUAL USER MANUAL
VERSION 1.2
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 SB18 enclosure has been designed for various, intensive indoor and outdoor sound
reinforcement applications. To fulfill such demanding conditions SB18 contains high-grade and reliable components:
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Weather-resistant transducer.
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Baltic birch plywood cabinet.
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Polyester powder-coated steel grill.
•
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Airnet high-resistant, non-biodegradable front grill fabric.
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Oxidation-resistant screws and rigging points.
However, in order to ensure product performance and safety, it is essential to frequently inspect the SB18 cabinet.
These checks need to be done on a regular basis depending on the conditions of use. The testing procedure consists of
three steps as described in [8.2].
8.2

Testing procedure

8.2.1

Acoustical check

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 unwanted noise.
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
In case of acoustical trouble, apply the Mechanical check [8.2.2] to verify if it is due to a structural vibration. If the
problem persists, replace the faulty electrical component [8.3.5-8.3.6].

8.2.2 Mechanical check

1. Inspect the general aspect of the enclosure and attached parts (no signs of deformation, fissure, or corrosion).
2. Check that all parts are well secured to the enclosure (front face, front bass-reflex panel, transducer, protective
edges, handles, connector plate, and pole mount socket).
3. Check the quality of contact and locking action of the SpeakON
In case of mechanical trouble, secure or replace the faulty component if it is authorized [8.3]. Otherwise, contact an
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L-ACOUSTICS authorized representative.
8.2.3

External aspect

1. Remove the dust from the front face with a vacuum device.
2. If necessary, repaint the cabinet (paint reference given in [8.3.1]).
If paint is applied, protect the mechanical parts.
Do not apply paint to the front grill fabric as it could fill the holes and deteriorate the acoustic
transparency.
IMPORTANT
SB18_UM_ML_1-2
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sockets.
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