Umair Gaines
Unwanted electrical interference can be a nuisance when recording audio. There are several reasons why your microphone may be picking up electrical buzzes, from electromagnetic interference to faulty cables. This issue can be tricky to troubleshoot, but there are some general steps you can take to identify and address the problem. This guide will help you reduce or eliminate that annoying electrical buzz from your microphone recordings.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Cause of Buzzing | Electrical problem, room background noise, cables, wireless devices, LED lights, low buffer size, faulty cable, electromagnetic interference, ground loops, improper shielding, poor wire connections, ground issues, static electricity |
| Solutions | Use balanced cables (XLR or TRS), use ground loop isolators, use high-quality shielded cables, turn off wireless devices, use FCC-approved LEDs, adjust buffer size to 512 or higher, tweak audio levels, use noise reduction tools, use EQ, use high-pass filter, use fades at the beginning and end of audio clips, adjust volume levels, use noise gate plugin, use Waves' X-Noise audio plugin, use noise suppressors, use audio repair software |
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What You'll Learn
Identify the source of the buzz
Before attempting to remove the electrical buzz from your microphone, it is important to identify its source. The buzzing noise could be caused by a variety of factors, ranging from the physical setup of your equipment to the type of cables you are using.
Firstly, check your cables. Loose connections can introduce buzzing noises, so ensure all cables, connectors, and audio equipment are correctly connected and secured. If the problem persists, try swapping your cables with another set to see if the issue continues. Faulty cables are a common cause of microphone buzzing, and even good cables can become damaged over time, so it is always worth checking.
If the problem is not your cables, it could be an issue with your setup. Electromagnetic interference (EMI) is a common cause of microphone buzzing. This can be caused by wireless devices, such as mobile phones, landlines, speakers, radio receivers, or even LED lights. Try turning off or moving away from potential sources of interference to see if this stops the buzzing noise. Power supplies are also notorious for causing EMI, so try relocating your power strip or power supplies to see if this helps.
Another potential cause of microphone buzzing is ground loop issues. This occurs when there is a loop for stray currents to pass through your equipment, causing electrical interference and unwanted noise. Using ground loop isolators is an effective way to eliminate this problem, as they break the electrical connection between components while allowing the audio signal to pass through.
In some cases, the buzzing noise may be caused by room background noise or the settings in your software. Try walking around your room with your microphone and headphones to listen for any interfering noises. If you identify a noise, turn off the device causing it or move your microphone further away when recording. Additionally, check your input controls and ensure they are not too high, as this can also cause buzzing sounds.
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Use shielded cables
Shielded cables are designed to protect against electromagnetic interference, which can cause buzzing noises in your recordings. Using high-quality shielded cables can help reduce buzz.
When buying new cables, check that they have proper shielding and connectors, as this will most affect the recording quality. You don't need to buy expensive cables, as long as they have the correct shielding and connectors.
For XLR microphones, if you are using a preamplifier or audio interface, some preamps and audio interfaces can produce an unhealthy signal that causes a buzzing or humming background noise. Make sure your gain isn't turned up too high and see if that helps.
You can also try using balanced cables (XLR or TRS) instead of unbalanced cables (RCA). Balanced cables have noise-canceling capabilities that can help reduce interference.
If you are handy, you can try adding your own shielding to your microphone setup. One way to do this is to add many turns of mic wire around a suitable ferrite torroid. You can also try connecting the shield and V- to the ground pin on the 3.5mm plug. This means that the mic V+ and ground are in the wires inside the mic cable, and the cable shielding is peeled back and connected to the microphone case.
However, it's important to note that shielding may not always be effective, and in some cases, it may act as an antenna.
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Remove buzz during post-production
While it is challenging to completely remove buzz from audio recordings, there are several ways to minimise or eliminate it during post-production.
Firstly, identify the source of the buzz. It could be caused by ground loops, electromagnetic interference, poor connections, faulty equipment or cables, or a low battery. If the buzz is due to electromagnetic interference, use shielded cables to protect against it. High-quality shielded cables can help reduce buzz. If you suspect a ground loop is causing the buzz, use ground loop isolators to break the loop and prevent unwanted current flow between devices.
Next, use audio editing software to remove the buzz. Many audio editing programs have noise reduction tools that can analyse and remove unwanted noise. Use an EQ to target and reduce the frequency range where the buzz is most prominent. Apply a high-pass filter to cut out low-frequency noise, including the buzz, and adjust the filter’s frequency setting to find the optimal level.
Additionally, use fades at the beginning and end of audio clips to reduce abrupt transitions that might accentuate the buzz. Adjust the volume levels of specific inputs with buzz to minimise their audibility. You can also use audio repair software, such as iZotope’s RX audio repair suite, to remove high-frequency buzz and noise. The RX Spectral De-noise feature allows you to sample and remove unwanted noise by adjusting the Threshold and Reduction controls.
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Adjust buffer size
Adjusting the buffer size can be an effective way to remove electric buzz from your microphone. A low buffer size can often be the cause of audio issues such as hissing, buzzing, and audio dropouts.
The buffer size setting affects the amount of audio data your computer processes at one time. If the buffer size is set too low, your CPU will require more computing cycles, which can lead to stuttering and other problems. Increasing the buffer size to 512 or higher can help resolve these issues and eliminate the buzzing sound.
However, it's important to note that adjusting the buffer size may introduce latency response issues, so you may need to experiment with different settings to find the optimal balance between reducing buzz and maintaining acceptable latency.
Additionally, if adjusting the buffer size does not completely eliminate the buzz, you can try tweaking your audio levels for both recording input and listening volume. Disabling the microphone boost feature, which can cause unwanted peaks, may also help reduce buzzing.
By making these adjustments, you should be able to significantly reduce or eliminate electric buzz from your microphone recordings.
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Use noise-reduction tools
Noise-reduction tools can be very effective in removing electric buzz from microphone recordings. Most Digital Audio Workstations (DAWs) come with built-in noise suppressors or removers. These tools work by taking a sample of the audio that contains only the buzz, analysing it, identifying the background noise, and then removing it from the entire recording.
To get the best results, it is recommended to highlight a part of the audio with no other sound than the buzzing. This makes it easier for the software to identify the noise you want to be removed. You can then apply noise removal to the rest of the recording. It is also important to make small, incremental changes to the frequencies to ensure that you eliminate the buzz without affecting the desired audio frequencies.
Some specific tools that can be used include iZotope's RX audio repair software, which has an RX Spectral De-noise feature. This tool allows you to sample the unwanted noise and then adjust the threshold and reduction controls until the noise is lessened. Another tool is Wave's X-Noise audio plugin, which can be used with different DAWs.
Additionally, you can use an EQ to target and reduce the frequency range where the buzz is most prominent. Be cautious not to affect the desired audio frequencies. A high-pass filter can also be applied to cut out low-frequency noise, including the buzz, by adjusting the filter's frequency setting.
While noise-reduction tools can be very effective, it is important to note that completely removing buzz can sometimes be challenging, especially if it is deeply embedded in the recording. Prevention, proper setup, and careful monitoring during the recording are crucial to achieving clean audio recordings.
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Frequently asked questions
First, try to identify the source of the buzz. It could be electromagnetic interference, poor connections, or faulty equipment. Try turning off or moving any electronic devices, such as lights, fans, heaters, or phones, away from the microphone. Check that all cables are firmly in place and try replacing any faulty cables with high-quality XLR or USB cables.
Audio editing software often has noise reduction tools. You can use EQ to reduce buzzing sounds by targeting and reducing the frequency range where the buzz is most prominent. Apply a high-pass filter to cut out low-frequency noise. You can also use audio repair software such as iZotope's RX Audio Editor or Logic Pro X's Noise Gate plugin.
If you are using a wireless mic, ensure that the batteries are charged and that the transmitters are at least 10 feet away from the microphone. Adjust your buffer size to 512 or higher to remove glitches. Use balanced cables (XLR or TRS) instead of unbalanced cables (RCA) to reduce interference.
Electric buzz can be caused by ground loops, electromagnetic interference, poor connections, faulty equipment, or low-quality wireless devices. It could also be due to issues with your microphone hardware or cable. Try replacing your microphone or cable to see if that fixes the issue.
