Learning about Equalizer – The distinction of Pro or Amateur

You may have seen and manipulated with Equalizer (EQ) in the civil stereos, amplifiers in music, in audio panel TV …You feel the change of the sound after the Coliseum stop to the lever, knob that? Yes, the bass up or subtract, brighter high tones, mid tones weakened …But in the studio, EQ with many more uses and EQ for studio equipment and more advanced, enabling more detailed intervention in sound.

It is important that if only choose one single device for mixing, I would choose EQ. And effective use of EQ What is distinguishing factor between a pro-class and amateur.

Frequency Sounds

Before some information about equalizer (EQ), we need to know how the frequency, by interfering in the modal frequency change of EQ sound.

Sound waves are a vibration is illustrated schematically sinusoidal. You can imagine the visual vibrations when strummed guitar strings.

Initially strong vibrating strings, big guitar sound. Over time, the vibration amplitude decrease, the volume decreases with guitar sound. Via vibrating strings, vibrate back and repeat this on a horizontal axis. Each time the strings move from horizontal axis goes up all the way down and go all the way down and back to the original position called the oscillation cycle.

The illustration above shows, the amplitude of the oscillations (amplitude vibrating strings) corresponds to the volume. And the decisive factor making ear we recognize the other negative tone higher, higher pitches different pitches located at a repetition rate of 1 cycle of the sound waves oscillate. That is the frequency (unit is Hertz – abbreviated as Hz).

1 Hertz (Hz) with 1 cycle oscillations / sec.

The higher the frequency of the sound pitch higher and vice versa.

Equalizer (EQ) is what?

EQ is an effect that helps you change the “color tint” sound by acting on the sound frequency as increase or decrease of specific frequencies.

This is the most important tool in the whole store “arms” the mixing of any pro mixer. The use of EQ proficiency course required when pursuing Mixing. Why? Since EQ can:

Helping the instruments blend together better by allocating sound frequencies between different instruments in a reasonable manner to avoid conflicts
Removing the audio frequency makes the listener uncomfortable
Clean Version Mix by removing excess frequencies – the frequencies the human ear can not hear or frequency does not contain musical instruments (eg over 12kHz, distortion guitar sound only hissing)
Improved sound by increasing or decreasing the frequency of certain groups
Change the color, sound nuances
Many such benefits but if someone sings bad, mispronounce, poor herd, the beat .. then EQ can not be saved. ?

In the framework of this article, I will introduce to you the basic features, and not go in-depth, you use EQ instructions specific cases. The Tips & Tricks with EQ I will write in the next series.

Basic control functions

When new touch devices / professional EQ plugin, you enjoy appalled because the controls like Gain, frequencey, Bandwidth (often denoted Q) …

Do not be afraid, let me explain briefly about them:


EQ frequency that the device will interfere. We should understand here is that the EQ center frequency will be taken as a benchmark. Since EQ will always impact on a group of frequencies around the center frequency and never affects only one single frequency in both. Frequency region is affected by Band EQ EQ called first.

There are multiple EQ allows you to control the frequency of the first affected this time.


After you have chosen a center frequency, your next actions usually increase or decrease the intensity of that frequency. To do this, you need Gain button.

If Gain = 0, of course, EQ without any impact on the selected frequency.

On the graphic EQ section illustrates the impact on the frequency, GAIN is represented vertically. Pictures illustrate the higher tones, gain more, that frequency has been intensified.

In some equipment EQ, they also share is even a separate button called Boost increases the intensity or Dip button to cut a specific frequency.

Bandwidth (usually denoted by Q)

On some devices called Resonance. This is the parameter specified level of impact of the increase / decrease in intensity for the selected frequency to the frequency around.

Q greater the frequencies around the affected less and conversely, the smaller the Q frequencies around affected as much.

You see his picture painting to better understand it. Purple markings indicate sound after the intervention. Plate 1 slightly darker purple background indicate the original sound.

You can clearly see the region is so high Q EQ effects of small, frequencies around the affected less.

The components (filters – Filter) basic EQ

Lowpass (HiCut) and highpass filter (LowCut) Filter

Please select one frequency, apply lowpass (also called HiCut) Filter, so you’ve removed all frequencies above the selected frequency. Frequency Cutoff taken as a landmark called Point.

Understand one way na, lowpass (LP) meant for the lower frequencies (Low) passing (Pass), do not touch them.

Highpass (abbreviated as HP, otherwise called LowCut) Filter has a similar mechanism of action but allows the higher frequencies Cutoff Point crossing and cut off the lower frequencies.

If you look closely, you’ll see Cutoff Point is not the frequency of diminishing intensity using LP and HP. In essence, at 1 Cutoff Point of the filter, is the point where the intensity is reduced by 3dB frequency.

Additionally, you can also see lines showing the impact of audio signal EQ to cut the frequency of the lowpass corner (LP) and highpass (HP) filter is never a straight line, but in the beginning there are always bent gradually stretching new tail.

Why so? For LP and HP are cut to 1 certain percentage, which helped generate sound smoother, more natural. Yes EQ lets you set how many dB cut after each 1 distance cutoff frequencies from 8 Point. How to calculate 1 8 based on the frequency interval? Very simple. 8 next stretch under 1 frequency value at half that frequency. 8 on the first interval frequency equal to 2 times that frequency.

If the cutoff point is 400 hz, the distance below its 8 200 Hz. If reducing the intensity ratio is 6dB / 8 is at 200 Hz intervals, HP will cut 6dB at 100Hz, HP will cut 12 dB.

Shelving Filter

Do you have questions highpass and lowpass why only cut without increased? As with progressive mechanism of action (increasing the impact in a given ratio), if instead of cutting, we grow, the distance just past 2 8 dB added number will reach 12 60dB depending on the original aspect ratio!

This will distort the signal and listen very uncomfortable regardless premium EQ nowhere.

Therefore, to increase / decrease the volume throughout the whole reached cutoff frequencies without distortion Point signal, we designed the Shelving Filter.

You want to look! Similarly lowpass and highpass filter Filter, Shelving Filter no community / cut an equal amount immediately to all the frequencies exceeding the cutoff point that gradually increase the level of impact until reaching sufficient numbers you select and then dB transformed into a straight line. This makes it sound more natural listening obtained.

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