L-Acoustics K1 User Manual

Corrective maintenance
Listening test
enclosure preset usable bandwidth
K1 [K1] 35 Hz - 20 kHz
K2 [K2 70] 35 Hz - 20 kHz
Kara [KARA] 55 Hz - 20 kHz
SB28 [SB28_100] 25 Hz - 117 Hz
KS28 [KS28_100] 25 Hz - 110 Hz
K1-SB [K1SB_60] 30 Hz - 80 Hz
Procedure
1. Load the preset on an LA8 / LA12X amplied controller.
2. Connect a sinus generator to the amplied controller.
Risk of hearing damage
Set a low sound level to start and use ear protection to adjust before testing.
3. Scan the bandwidth focusing on the usable range.
The sound should remain pure and free of unwanted noise.
Troubleshooting for LF/MF speakers
One or more LF/MF speaker produces distorted, buzzing, rubbing, clicking, mufed or weak sound.
Possible causes
• The screws are not tightened with the appropriate torque.
• There is an air leak in the gasket.
• There is dust on the cone.
• The cone is damaged.
• The surround is torn or delaminated.
• The voice coil or the spider is damaged.
Procedure
1. Visually inspect the cables and the connectors.
2. Visually inspect the speaker cone, the voice coil and the spider.
If any damage is visible, replace the speaker.
3. Carefully clean the speaker with a dry cloth.
4. Repeat the listening test.
If the problem persists, replace the speaker.
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.
40 K1 user manual (EN) version 6.0

L-Acoustics K1 Specifications

General

Frequency Response	35 Hz - 20 kHz
Nominal Impedance	8 ohms
Enclosure Material	Baltic birch plywood
Components	2 x 15" LF, 4 x 6.5" MF, 3 x 3" HF
Amplification	External
Connectors	2 x NL4