Wireless microphones transmit sound through radio signals. If there is a humming sound, it is usually caused by the following reasons:

1. Low battery power, requiring a battery replacement;

2. Signal interference, necessitating a frequency change;

3. The receiving distance is either too close or too far, requiring appropriate adjustment.

Methods to resolve the humming sound:

1. Check for circuit issues.

Inspect the circuit where your wireless microphone is connected to see if there are any problems, and check if the wireless microphone's battery is low; replace the battery if necessary.

2. Adjusting Frequency

Adjusting the frequency may be helpful. Interference can also affect the frequency, so it's important to tune it to a clean frequency.

3. Adjusting Reception Distance

The reception distance of the wireless microphone is another crucial factor. If the reception distance is too close or too far, it can lead to the occurrence of hum. Therefore, it’s necessary to adjust the reception distance appropriately

 based on the specific situation to ensure stable signal transmission.

4. Replacing the Microphone

If you encounter a hum issue that cannot be resolved, you might consider replacing the microphone, as it may be the source of the problem. Replacing the microphone should be done after other methods have proven ineffective.

Summary:

Hum in wireless microphones is a common issue that affects sound quality. In brief, addressing microphone hum requires a multifaceted approach. If the above methods do not resolve the issue, it may be wise to seek the advice of a professional. Additionally, 

it’s important to maintain the performance of the microphone by avoiding prolonged use and steering clear of harsh environments.