Care And Maintenance; Maintenance Information; Testing Procedure; Acoustical Check - L-Acoustics KARA Manuel D'utilisation

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CARE AND MAINTENANCE

CARE AND MAINTENANCE
CARE AND MAINTENANCE CARE AND MAINTENANCE
8.1

Maintenance information

®
The L-ACOUSTICS KARA
reinforcement applications. To fulfill such demanding conditions KARA contains high-grade and reliable components:
•
Weather-resistant transducers.
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Baltic birch plywood cabinet.
•
Polyester powder-coated steel grill.
•
®
Airnet high-resistant, non-biodegradable front grill fabric.
•
Oxidation-resistant screws and rigging points.
However, in order to ensure product performance and safety, it is essential to frequently inspect the KARA 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 LA8 amplified controller. Apply a sweep from 55 Hz to
20 kHz with a maximum voltage of 0.2 volts (-12 dBu, -14 dBV): the sound should remain pure and free of unwanted
noise.
0.2 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 [8.3.4-8.3.7].

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 fixed parts are locked tight to the enclosure (rigging elements, protective handles, grill, rear panel,
and transducers).
3. Check that all mobile parts operate normally (ball-locking pins, front arms, angle arms).
4. Check the quality of contact and locking action of the SpeakON
In case of mechanical trouble, lock tight or replace the faulty component IF it is authorized [8.3]. Otherwise, contact
®
an L-ACOUSTICS authorized representative.
8.2.3

External aspect check

1. Remove the dust from the front face (two grills and HF fabric) with a vacuum device.
2. If necessary, replace the HF protection fabric [8.3.2].
3. If necessary, repaint the cabinet (paint reference given in [8.3.1]).
If paint is applied, protect the mechanical and plastic parts.
Do not apply paint to the front grill fabric as it could fill the holes and deteriorate the acoustic
transparency.
IMPORTANT
KARA_UM_ML_1-3
®
enclosure has been designed for various, intensive indoor and outdoor sound
w w w . l - a c o u s t i c s . c o m
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sockets.
EN
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