This basic rule helps you to retain the natural characteristics of the sound when EQ:ing.
Cut to address problem frequencies. Use narrow Q. Aim for removing nothing but the necessary. If you cut too much or too wide, you start to lose the original character of the sound. When keeping the cut narrow, it will often remain largely inaudible to our ears.
Shouldn’t we boost narrow too, then?
It would sound like the logical thing to do, but funnily enough – for boosting it’s the exact opposite.
Narrow boosts create unnatural harmonics and timbres that our ears are quick to recognize as something that shouldn’t be there.
Most of the time you are much better off using wide boosts. This will again retain the original character of the sound – yielding much more subtle and natural results.
If you do decide you must boost narrow in any case, be extra careful. Any sounds that will hit your narrow boost frequency area will jump out over everything else.
Also keep in mind the tip from a couple of weeks back. It is the necessary foundation to getting any EQ right: