How to Correct an AC Hum on a Wireless Mic
Wireless microphones are used by many professional musicians to increase their freedom of movement on stage while not losing sound quality. Since these microphones use wireless transmitters to send the audio signal to the PA system, you no longer need long audio connection cables, making them ideal for large venues. Audio problems such as a humming and buzzing can result from an interruption in communication between the microphone's wireless transmitter and its receiver unit, among other things. Luckily, audio distortion on a wireless microphone system can be resolved in a few basic troubleshooting steps.
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Instructions
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Verify that you are not using the microphone outside of its maximum broadcast range. Like all other wireless devices, wireless microphone systems are limited by a maximum range over which they can broadcast. Check the documentation that came with your wireless microphone to find the microphone's maximum broadcast range. If you are out of range, move closer to the wireless transmitter unit. Check the microphone to see if the buzzing has been eliminated.
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Avoid getting near devices that might cause audio interference, such as a nearby TV or radio station. A high-powered transmitter in the area can cause audio buzzing or humming. Move the wireless microphone and transmitter away from the TV or radio transmitter to see if this is the cause of the audio distortion.
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Remove any sources of RF (radio frequency) interference, such as computers, lights, or ungrounded power supplies that might be near enough to the wireless transmitter to cause audio distortion. Move the wireless mic and transmitter away from the offending device and retest the audio quality for any improvement. If there is still buzzing or humming at this point, the wireless microphone might need to be serviced or replaced.
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