In this video, Echo Sound Works dives into the ideas and concepts around two very different methods of equalization.

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Subtractive EQ and Additive EQ. 

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Each has a different purpose in the mix and each of these tools are very powerful in helping you sculpt the perfect sound. 

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How do you know when to use one or the other or even both at the same time?

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In any mix, some tracks require subtractive EQ and other may require additive EQ. You have to use your ears and be the judge, even though a lot of sites will tell you that you should NEVER use additive EQ, ultimately it's up to you. Additive EQ is more like an effect than a surgical tool. Subtractive EQ fixes things, additive EQ can makes things more interesting. Which I guess in a way, can fix things in the context of a mix.

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I use a combination of both in every mix . I will say that I mainly use subtractive EQ in an overall mix, but there are definitely times when using an additive approach makes an element of the mix pop out more.

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Check out the video to see and hear the difference between these two types of EQ and when I like to use each in a mix.