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  • Are You Just Turning Knobs Or Do You Really Know What You're Doing?
  • Kevin Edwards

Are You Just Turning Knobs Or Do You Really Know What You're Doing?

Are You Just Turning Knobs Or Do You Really Know What You're Doing?

For a long time i really didn't really know why i did the things i did when mixing a song other than just liking the way it sounds. That is the golden rule of all engineers, when all else fails "trust your ears", but it should be noted further that you must know what to listen for and then what specific moves need to be made to create the sound and texture that you need to take the mix to another level.

For a long time i was just turning knobs and experimenting which is a stage in the development of any skill, it was through this process that i was able to develop my own personal taste and style through just moving things around til i got something i liked rather than knowing exactly what i was doing, i just knew that it sounded good.  

It is only a natural inclination to want to go to another level once you are ready for it, so i then began to actually study audio engineering, reading books and watching tutorials about everything from frequencies to mix bus processing. I am writing this post because i beleive that their are too many so called engineers who are just turning knobs and do not really have any method to their madness. They are heavily dependent on factory presets and do not know how to carve out frequencies that allow for all instruments and vocal tracks to blend together.

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Everything is over done and over produced, perhaps this is because studio equipment is now so readily available and affordable so more and more people are getting into mixing and mastering music. But before you claim the title of engineer and ask anyone to pay you to mix their tracks, you better know what the attack and release knobs do when you compress a signal, you better know how to sweep and apply subtractive EQ to remove harsh frequencies and how to use proper stereo imaging to create depth and width of the mix. If you cannot hear a problem and then know how to go about fixing the problem, then you are not an engineer, AutoTune doesn't fix everything.

I started this blog to help aspiring artists, songwriters and engineers get better at their craft. I wouldn't be doing so if i didn't post an article aimed at doing just that. So below is a post about better understanding the power of EQ (the most powerful audio processing tool that you have) and how to properly apply it to your mixes.

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Read This Article Below

You could potentially improve your mix quality by taking one little step;  learning how the channel EQ controls affect sound frequencies.  They may not work like you expect.

Turning knobs

I recall seeing the EQ knobs labeled “High” and “Low” as I looked upon the sound board during my first time mixing.  “I know what those mean,” I thought.  “I can increase or decrease those high and low frequencies.”  I was only partially right.

The high and low knobs do allow me to boost/cut those appropriate frequencies, but it begs the questions;

  • What are the actual frequencies being affected?
  • How are they being affected?
  • Are they all being treated equally?
  • What about the mid-range is so important that it gets its own “Sweep” knob?
  • And if your channels have a Q option….what in the world is Q?

Before digging into these questions, let’s first cover the two types of channel EQ controls…

Parametric vs. semi-parametric EQ

Parametric equalizers allow the control of three primary parameters:

  • The primary frequency point in which changes will occur. This is called the frequency or center frequency.  A sweep-able control allows you to change this point.
  • The type and amount of change.  For example, a boost or a cut and the degree to which you do that, such as a 3 dB cut or a “-3 dB” change.  This is known as the amplitude or gain.
  • The range of frequencies which will be affected by the change.  This is known as the Q value or bandwidth.  Changing the Q will increase / decrease the range of frequencies around the center frequency.

Using a parametric equalizer, you would alter a sound by;

  1. Picking the center frequency with which you want to focus your tonal changes.
  2. Selecting the bandwidth (Q) which represents the equal number of frequencies to the left and the right of the center frequency which you want affected.  For example, you can select a wide bandwidth to affect a large number of frequencies or a small bandwidth to affect a lesser number of frequencies.  Ever heard the phrase, “cut narrow, boost wide?”
  3. Altering the amplitude by applying a cut or boost to that specified frequency range.

A semi-parametric EQ is a parametric EQ with one or more missing features, typically the bandwidth (Q).  You might see this in a mid-range EQ control that doesn’t give an option for controlling the bandwidth (Q).

When it comes to digital EQ controls wherein you are using a computer screen to visualize the EQ curves and make changes, you are using a parametric EQ that also can allow for using multiple frequency center points so you aren’t limited in the number of points you can control.

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Two Forms of Control

So far, the terms frequency center point, amplitude/gain, and bandwidth (Q) have been discussed.  What hasn’t been discussed is the forms of EQ in which these can be controlled.


Peaking EQ: A peaking EQ is exactly as it sounds.  You select the frequency center point which is set up on the top of a bell curve.  If you have a Q control, you can adjust the width of that bell curve.  Your mid-range controls are peaking EQ’s.  You might even have an EQ control labeled “High-Mid” which would qualify as a mid-range peaking EQ.  In this image, the blue line indicates a wide boost while the red line indicates a narrow cut.


Shelving EQ: A shelving EQ is one in which only frequencies on one side of the frequency point are affected.  It will still have a natural curve but that amplitude control is only on one side.  This will be your High and Low EQ knobs.  In this case, all frequencies are affected equally.  For example, on the low EQ, all frequencies below 100 Hz are cut or boosted equally.  In this image, the red line indicates a low frequency shelving EQ with a cut to the frequencies.  The blue line indicates a high frequency shelving EQ with a boost to the high’s.

Know your frequency points

There is one critical bit of information we haven’t discussed and it’s the one I overlooked when I first started mixing; the baseline values.

The high and low shelving EQ’s have a set frequency point.  Your mid-range peaking EQ’s have a baseline frequency.  Do you know what they are?  I hate to tell you, but you need to crack open your manual.  For example, in my mixer, the frequency point of the High EQ knob is 10 kHz and the Low EQ knob is 100 Hz.

Knowing the baseline frequencies, especially with the shelving EQ’s, you can identify the exact frequency point in which you will base your cuts and boosts.

Going to the next level

Let’s look at what you can discover given all this information.  I’ve got a mixer with a fixed channel high pass filter of 80 Hz.  Engaging this, all frequencies below 80 Hz are significantly cut with a shelving ratio of around 18 dB per octave.  Considering my Low EQ frequency point is 100 Hz, then when I boost or cut my lows with the HPF engaged, I’m affecting a very small range of frequencies.  If I really wanted to get some thump out of my kick drum, I wouldn’t want that HPF engaged.  But what if I could use that HPF to get a sound from my kick drum that fit the song?


The channel EQ buttons give you a lot of control over how you modify a sound.  Knowing exactly how they control them and knowing their frequency characteristics, you might see them in a new light with new possibilities. And knowing those baseline frequencies…just one more way you can master your mixer and improve your mixes.

Full Article:

In my opinion i think the single most intimidating thing to aspiring engineers is the technicality of mixing, the jargon used, the mathematics entailed and the critical thinking skills it takes to analyze a mix and make it better, not just different but actually make it better. You will however have to get passed it, and when you do you will sound like a professional to other aspiring engineers because you actually know what your doing and why your doing it when it comes to mixing a song.

  • Kevin Edwards

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