An Equalizer – EQ is a tool for recording and mixing music. Fortunately, you don’t need any prior experience with audio engineering to use and take advantage of a sound equalizer. 

Using a dedicated app or manual controls, anyone can use an EQ to alter the sound signature of their speakers or headphones. There are various best sound equalizers you can use to enhance your system’s sound output. 

But you must first understand what is EQ and how it functions in order to receive the finest outcomes from it. Let us understand everything about sound equalizers in detail below.

Introduction – Sound Equalizer 

An equalizer, abbreviated as “EQ,” is an audio filter that isolates distinct frequencies. It either reduces, boosts, or retains the actual level of those frequencies. 

A wide range of electronic devices including stereo systems, amplifiers, and mixing boards comes with an equalizer.

An equalizer can change the color of audio signals. It can also increase the clarity of vocals by boosting the treble frequency range. Also, increasing bass frequencies it can make the sound output of a song heavier. In some cases, it can be used to eliminate specific unwanted and loud sounds from a recording.

Let us dive into the detailed working of EQ. 

Working of Sound Equalizer

With the use of an equalizer, you may change and emphasize certain frequencies over others to get better audio output. Most people use linear filters to do this. Depending on the equalizer’s interface, certain filters operate differently.

Below listed are a few common categories of equalizers. Let us understand them and their work in brief. 

1. Parametric Equalizer (EQ)

There are three controls for it. The first one involves choosing which exact frequencies you wish to cut or boost. 

The second one, often known as the Q, determines the sharpness of the sound bandwidth. The third option is level control, which determines how much you want to increase or decrease a frequency. Typically, parametric EQs take the form of digital software.

2. Graphic Equalizer (EQ)

A graphic EQ is the most common type of EQ. It can be found on a lot of devices, including home audio systems, portable stereos, amps, pedals, and mixing boards. But, it is less accurate than a parametric EQ. 

This EQ divides the audio spectrum for you and gives each band a specific knob or fader. You may go through all the knobs/faders and increase, reduce, or leave them as it is as per your choice. 

Generally, graphic EQs contain only three bands, typically referred to as “bass,” “mid,” and “treble.” 

Graphic EQs with five bands are commonly found in home stereos. Also, there are graphic EQs available with up to 30 frequency bands.

3. Shelf Equalizer (EQ)

Based on what you choose: a low shelf or a high shelf, shelf EQ modifies everything either below or above a frequency you choose. 

You can have control over both the cutoff and the level of gain reduction that occurs to the attenuated frequencies. Clearly, low-shelf EQs concentrate on lower frequencies whereas high-shelf EQs focus on higher frequencies.

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How to Effectively Use Equalizers?

It’s important to keep in mind that an EQ is mostly used in the recording studio to deal with troublesome frequencies that stand out in a track. Secondly, it’s a creative tool; even if there isn’t an issue, boosting the high mids on a vocalist’s voice might give it a gravelly delivery. 

Also, boosting the highs on a guitar can give it a little more sheen or airiness. Moreover, you can utilize it to produce distinctive effects.

You can find an EQ in-built into the app that comes with your headphones or speaker. But some in-app EQs are just not very useful, and not all headphones and speakers come with them.

If that is the case, then both iOS and Android users can install third-party EQ apps. If you listen to music mostly on a laptop or desktop, there are also several EQ apps available for macOS and Windows.

Normally, for cutting and boosting, lowering or raising a fader is all that is necessary. Finding a problematic frequency, however, is a little more challenging. Start by amplifying a band and checking for changes. 

You should check for the offending frequencies that come out louder and are creating trouble. Try to work on such problematic frequency ranges. 

If you can’t find them, then reset that band to zero and attempt another one until you find the band or bands that are closest to the offending frequencies.

To prevent overloading your drivers, make sure to gradually increase the gain rather than setting it to the maximum immediately.


A sound equalizer is a very important tool for all the people who wish to make the most out of their music. Hence, this article included everything you need to know about sound equalizers, their types, and how they can enhance sound output. 

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