How to eliminate speaker noise (bottom noise)

- Jul 04, 2020-

01 white noise

White noise is a kind of random noise in the whole frequency domain. It sounds like a continuous "hissing" sound, similar to the sound of snowflakes on TV when there is no signal.

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White noise is usually generated by the gain device or power amplifier in the equipment. If the volume is adjusted too high, it is easy to produce obvious bottom noise. At this time, it is necessary to check the output volume of sound card, software and speaker to ensure that there is no overload in each link.

PS: highly sensitive microphones, such as condenser microphones, can pick up the noise that human ears can hardly hear in the room environment, such as air conditioning, outdoor noise, wind noise, etc. Don't ignore the influence of environmental noise when recording.

02 digital distortion

Digital distortion often makes a harsh "buzz" sound, which doesn't sound like the sound in nature. Generally speaking, it will vary according to the process used by the computer. For example, when using different software or effectors, the digital distortion will also change.

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Digital distortion is usually caused by some problems of sound card, or monitoring speaker and computer connected in the same socket. Make sure that the power supply of your monitor speaker or other playback equipment (such as monitor controller) is connected to a separate power outlet with other digital devices such as computers. Or use a reliable power adapter.

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03 echo howl

Feedback is usually due to the microphone is too close to the speaker, the microphone will pick up the sound of the speaker and cause self excitation. At this time, there will be harsh high-frequency whistling. When watching some small bands perform tuning, it will often appear.

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When recording, wear headphones instead of monitor speakers to monitor, so that the microphone will not pick up the sound of the speaker and generate self excitation. If there is no condition to use headphones for performance or performance, you can keep away from the speaker and reduce the microphone gain.

04 crackling noise

These are usually divided into two types:

One is random distribution crackle, the most likely reason is the software parameter setting problem. Increasing the buffer size should do the trick.

The other is rhythmic crackling sound, such as once every half a second, which may be caused by damaged sound card or incorrect installation of driver.

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This kind of crackling noise is often caused by incompatible software or driver of sound card. For example, the buffer size is set too low, Bluetooth or wireless devices are connected to the system, or the software compatibility is poor. You can check the software compatibility of the sound card on the official website to see if your computer does not meet the minimum requirements required by the sound card

If this kind of noise comes from your speaker, you can try to unplug the speaker and plug it into the headphones to determine where the noise comes from