L-Acoustics X12 Owner's Manual page 45

Troubleshooting for HF drivers
One or more HF driver produces high-frequency harmonic distortions, strange vibrations or weak sound.
Possible causes
• There are foreign particles on the air gap.
• The diaphragm is not centered correctly.
• The screws used for reassembly are too loose.
• The diaphragm is damaged.
• The number of shims is wrong.
Procedure
1. Perform the diaphragm disassembly procedure.
2. Visually inspect the diaphragm and the voice coil.
If any damage is visible, replace the diaphragm.
3. Clean the air gap thoroughly.
Use double-face adhesive tape to remove any particles.
4. Perform the diaphragm reassembly procedure.
Pay close attention to the number of shims and the position of the diaphragm.
Apply the recommended torque.
5. Repeat the listening test.
If a buzzing sound is still audible, it might be necessary to add an extra shim on the air gap.
If the problem persists, replace the driver.
X12 owner's manual (EN) version 1.0
Inspection and preventive maintenance
45