Care And Maintenance; Maintenance Information; Testing Procedure; Check Of Transducer And Enclosure Acoustic Behavior - L-Acoustics 12XT Manuel D'utilisation

12XT
COAXIAL ENCLOSURE
user manual
VERSION 1.2
8

CARE AND MAINTENANCE

8.1

Maintenance information

The L-ACOUSTICS ® 12XT enclosure is a technical product designed for various, intensive indoor and outdoor sound
reinforcement applications. To fulfill such demanding conditions L-ACOUSTICS
grade and reliable components:
• Weather-proof transducers made of materials with high immunity to oxidation.
• Baltic birch plywood-made cabinet.
•
High resistance, non biodegradable "Airnet" front grill fabric.
• Screws and rigging points resistant to oxidation.
However, in order to ensure product performance and safety, it is essential to frequently inspect the 12XT 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 a transducer needs to be 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 LA4 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 any
unwanted noise. If not, check the mechanical assemblies and, if necessary, contact an L-ACOUSTICS
representative to repair or replace damaged components (see also section 8.3).
!
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
Whenever a transducer 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 socket. Cabling 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 rigging elements, loudspeaker,
diaphragm, and grill). Check the quality of contact and locking action of the Speakon
of rigging elements (no signs of deformation, indents, or rust). If necessary, contact an L-ACOUSTICS
representative to replace damaged components.
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 mechanical parts.
Do not apply paint to the front grill fabric as it could fill the fabric holes and deteriorate the acoustic
transparency of the material.
IMPORTANT
12XT_UM_ML_1.2
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