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The secret of EQ explained from observation
Here's some info on eq that is simple, but powerful once you understand it. I share it because if you really understand eq, it opens up the possibilities in sound for you greatly.
First, what happens when you increase the eq? Simply, you are increasing the volume around a specific frequency of sound.
So that leads to the question of what frequencies make up my sound. Think of a simple trance bass note, specifically the A tone. It is made of a fundamental frequency of 55Hz and a series of harmonic sounds octaves higher. The cool thing about octaves is there is a simple mathmatical relationship. Harmonics which are an octave higher are double the Frequency. So the A bass note probably is made up of a frequency at 55Hz, 110Hz, 220Hz, 440Hz, with the higher frequencies being softer than the fundamental.
So how does this apply to using EQ with your mixer. Well, first you need to understand the capabilities of your mixer. Become a tech-nerd and pull out the spec sheet of your mixer. I bet you never looked at that. You need to see which Frequency ranges the high, mid and low knobs emphasize.
For example, I have a DJM600, and the low emphasizes 70Hz, the mid at 1kHz and the high at 13kHz. Since bass is around 60Hz, if I turn up the 70Hz knob, all the sound around that range gets a little louder.
Now here is a key thing to rembmer. Remember how I said there is an octave relationship for different harmonics. Most trance melodies are only about 3 or 4 octaves above the bass line. So for example, the fundamental for the slide guitar in ATB's 9p.m. is 3 octaves above the bass, or around (55, 110, 220)... 440 Hz. So with my DJM600 mixer, even if I wanted to turn up the slide guitar much, I couldn't since my mids are located at 1000Hz. I might be able to get the harmonics 2 octaves above this sound, but not effect the main sound itself.
So as a simple example of how to apply this, suppose I had some song with high beep sounds with many harmonics around 1000Hz. I could turn my mids down so you could here the noise at 1000Hz of the song coming in (Usually some of the higher frequencies of the high hat sounds). A general rule in mixing is to not have too many sounds in 1 frequency range clashing.
Once you start thinking about this, it just opens up possibilities of exploring sound. So now its time to get creative!
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