What Is a Microphones Frequency Response and Why Is It Important To Know?

If you’ve ever wondered what a microphones frequency response was, this article is for you. In this article, we’ll discuss what the f-shape is, what it means to have a flat frequency response, and how the distance of the sound source affects a microphone’s sensitivity. In addition to the f-shape, we’ll also look at colour and flatness, as well as acoustic features such as proximity effects, self-noise, and loudness.

Sound waves

The frequency response of a microphone is a chart that shows the sensitivity of the microphone over a range of frequencies. Then How To Measure Audio Performance Of Electro-Acoustic Devices? It also shows the flatness of the sound, colour and high-pass filtering. It also shows proximity effect and rear pick up. The flatter the response, the better the microphone. However, some mics have unnatural peaks and valleys that can be distorted by certain sound sources.

Understanding Microphone Frequency Response - Azden

One way to determine the frequency response of a microphone is to view the graph of its sensitivity. This frequency response chart will tell you the range of frequencies the microphone can handle, including the high-frequency frequencies. It will also show the output levels in decibels. The frequency response of a microphone is an important aspect to consider when buying a new microphone. A microphone’s frequency response can affect the quality of recorded music.


All microphones have an inherent noise characteristic, referred to as self-noise. It is an unwanted presence of the microphone that is a natural consequence of the laws of physics. The signal-to-noise ratio (SNR) of a microphone is the measure of its noise level compared to its 94 dB SPL threshold. Manufacturers of microphones can improve their SNR by using various techniques, such as circuit design, circuit layout, and signal detection system.

One of the most common ways to measure Self-noise in a microphone is by comparing its self-noise rating to the noise produced by a speaker in the same room. A microphone that has a lower Self-noise level than another one is generally regarded as quiet. A 10dBA Self-noise rating is an excellent measure for an audiophile recording. Self-noise is not a factor for determining the sensitivity of a microphone, however, when it comes to recording sound sources.


Frequency response is an important feature of a microphone, as it describes the output of the microphone at different frequencies. The frequency response indicates the sensitivity of the microphone, and it is usually measured with an acoustic signal in a free field or on-axis direction. Microphones for near field use are measured from a short distance, and their frequency response is much shorter. While the frequency response specification of a microphone usually covers a range of 20 Hz to 20 kHz, the actual effective range is much less detailed. For this reason, a chart that plots the mic output over the spectrum is more useful.

The frequency response of a microphone is a vital part of recording audio. This sensitivity varies widely between different sources and can be difficult to match. Different microphones have different frequency responses, and it is important to understand the differences between them to decide which one will work best for your project. Ideally, the frequency response of a microphone will be flat from 0 to 12 kHz, with no peaks or dips.

Sound source distance

If you are going to record sounds, you must understand how sound is reflected and measured. This effect is called Doppler Effect and happens when the source and microphone are far away. This phenomenon is the result of sound energy refracting off of a surface or an object and causing it to reflect back. In a perfect free field, this refracting energy will reduce the sound level by 6dB for every doubling of the distance.

If the source is far away, sound will arrive at the front and rear of the microphone as plane waves. The sound will still arrive as plane waves in the near-field, but the distance will be smaller. The mic’s response is similar to its far-field response, although it is different for high and low-frequency sound. This is an important consideration in acoustics. If you are using a microphone to record a speaker, you should use a microphone that is close to the source.

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