On the previous topics we talked about how to record live instrument and MIDI in your MIX, about automation in DWS and Dynamic processors. And today i would like to demonstrate effective use of “mirror EQ” in a mixing context.

This is a project of my song in Logic 9 PRO.

Mirror EQ is a technique that we use when we have certain tracks in our project with similar frequencies, which makes it hard to sound clear and independent from each other.

In our MIX we have a lot of different tracks:

There are 2 solo instruments: cello 1 and trombone.

Piano and Clav play rhythm of the song,

Lute, Bass, lead vocal and 

1 cello plays bass voice and two other - middle voices.

So, we have tracks A and B "competing" for the same frequencies. Mirror EQ would basically consist of boosting the best sounding frequencies of track A and the best sounding frequencies of track B. Then, in track A we would attenuate the frequencies that we boosted in track B, and in track B we would attenuate the frequencies that we boosted in track A. This generally makes instruments sound thinner by themselves, but clearer and fuller when sounding together.


Let's talk about these 2 voices of cello. It sounded kind of muddy and nonclear. What I have to do to make them sound clearer, is mirror EQ them.


So, to mirror EQ them, I used a visualizer to see which frequencies were sounding naturally in track "cello 2" and which frequencies were sounding naturally in "cello3":

I noticed that the "favourite" frequencies in cello2 were around 300hz and 3khz, and "favourite" frequencies in cello 3 were around 180hz and 1khz. With that information, I used the EQ in each track to boost its best frequencies and attenuate the worst frequencies. Watch the slides and compare them ;)


Of course the sound in mix "before" is more naturall. But in the context of main mix it is too heavy and create unclear region of music. That is why mix "after EQ" will be better there.


P.S. This MIX is a song for lesson 5 Assignment "songwriting" on coursera.org ;)

Highly recommend this course!)

Copyright © Roman Shirokinskiy