Types of EQ

I’m sure most of you have used EQ controls many times, on the stereo, instrument, amp, etc. But there’s a lot of misunderstanding about how certain controls affect the sound, and how the different types of EQ work.

Equalizers can be used to change the character or a sound of an instrument, to do so we will have to alter the harmonics or the fundamental frequency, additionally, we can also use an aural exciter to alter harmonics. But you must bear in mind that by altering a separate instrument you will affect the mix, usually is more important how the instrument sounds along with others (in the mix), then by itself.

So, even if an instrument sounds good individually “as is”,  it may interfere with other instruments in the mix, which may result in poor clarity. This can happen because there’s a peak at a certain frequency that should be attenuated or simply because there are too many instruments in the same frequency range. You must use the equalizer to attenuate or clear some frequencies in certain instruments to achieve more clarity in the mix. This problem is known as masking.

In this article, we’ll explain 4 types of equalization: Shelving, graphic, semi-parametric and parametric.

Shelving EQ

This type of eq is the most simple and inexpensive, can be found in any common equipment such as a stereo or Hi-Fi equipment. It offers the possibility to control the bass and treble, sometimes it also has a “mid” control. You can increase or decrease the gain and the central frequency and bandwidth are fixed, this type of equalizer is less commonly used in professional audio but can be a simple way to control EQ. I’m sure you’ve seen this type of equalizer in many analog mixers, MasteringBOX EQ Control is similar to a Shelving EQ, with some differences in the back end.

Graphic equalizers

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These were the most used in professional recording in the 20th century, given its versatility and ease of use. However, they are not as precise as the parametric equalizers and nowadays they are not that common.

They’re different types of graphic equalizers, the most common is the octave graphic equalizer, which has 10 frequency controls. This is pretty consistent because the audible bandwidth runs 10 octaves that are 30 Hz, 60 Hz, 125 Hz, 250 Hz, 500 Hz, 1 KHz, 2 KHz, 4 KHz, 8 KHz, 16 KHz. And it is in those frequencies where we can increase or decrease the intensity of the audio signal.

Parametric EQ:

The parametric equalizer is the most precise and versatile type of EQ, because it lets you select the center frequency we want to equalize, bandwidth and gain. There’re also multi-band parametric equalizers, the most common is the 4-band parametric EQ. It is also the most complex equalizer of all and can be hard to set up when you don’t have a graphical representation (analogue hardware).

This equalizer can be used as a filter to eliminate or attenuate unwanted frequencies, noise or interference. Such problems usually happen in a certain frequency range, so a parametric equalizer is ideal for these purpose.

Semiparametric equalizer:

This equalizer is similar to the parametric EQ and allows you to select the frequency you want to equalize and the gain, it differs from parametric EQ because you can not change the allocated bandwidth.

Conclusion

Is up to you which type of equalizer to use, it is a good thing to learn how to use a parametric EQ because you will need to use it many times, and even if it can be difficult at first, you will benefit from its precision and versatility. So… which EQ do YOU like most? Leave a comment and let us know!


Post Images under Creative Commons Attribution License by Will Fisher and Vegansoldier

Comments (2)
  1. wallyhm says:

    Parametric EQ!!

  2. kalillita dub says:

    Please Explain this with more graphics or something…thanx

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