SERVICE
F A Q
No sound from the classroom speaker system?
First, check whether the power is properly turned on and the speaker cables are securely connected. Make sure the audio source (e.g., microphone, computer) is functioning and not muted. If all connections are correct, inspect the amplifier status or try using a different audio cable.
How to solve microphone feedback (screeching noise)?
Feedback is usually caused by sound looping between the microphone and speaker. To reduce it, lower the microphone volume, avoid pointing the microphone at the speakers, and maintain a proper distance. Using a unidirectional microphone can also help.
Why does the speaker volume fluctuate unexpectedly?
This may result from loose cable connections, low microphone battery, or improper automatic gain control (AGC) settings. Check all connections, replace batteries if needed, and disable unnecessary sound effects.
Hearing static or noise from the speaker?
Electrical interference, grounding issues, or worn cables could be the cause. Keep power and audio cables separate, use shielded audio cables, and check for oxidized connectors. Try switching outlets or adding a power filter.
Wireless microphone not connecting to the speaker?
Make sure the microphone and receiver are on the same frequency band and that the antenna is properly installed. Ensure the receiver is correctly linked to the amplifier. For UHF or VHF systems, avoid frequency overlap.
Interference or cross-talk between classrooms?
This is usually due to frequency conflict. Assign different frequency channels for each classroom and avoid adjacent frequencies. You can also use digital frequency-hopping technology to minimize interference.
Sound is unclear or muffled?
This may be due to improper tone settings. Adjust treble and bass levels and optimize the reverb setting. For better clarity, consider improving classroom acoustics by adding sound-absorbing materials.
No sound when playing audio from a projector or computer?
Confirm that the audio cable (e.g., 3.5mm to RCA) is correctly connected and the computer is using the correct audio output device. Try replacing the cable or restarting the amplifier.
Loud “pop” noise when turning on the system—is this normal?
This is a common power-on surge sound and generally not a fault. To prevent damage, follow the proper sequence: turn on the audio source first, then the amplifier. When shutting down, turn off the amplifier first
Is regular maintenance required for the classroom sound system?
Yes. It's recommended to check all audio cables, amplifier, and microphone battery status each semester. Clean dust from vents and equipment surfaces, and test audio performance to ensure stable operation during class.
Room 130, TCL Creative Center,
#69 GuangPu West Road,
Guangzhou, CN
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