I decided to adapt information from various sources that would explain EQing methods for different frequency ranges.

So here is a general suggestion guide to mastering EQ frequencies:

(keep in mind that these are not rules, just helpful suggestions)
(Also, try using this for dealing with individual elements within a song itself)

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0 Hz to 40 HZ:
~ All these frequencies should be removed from the mix with shelving filter(s). This will free the low-end energy of the speakers, which will create better headroom for the low end and allow your speakers to replicate the music better.

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40 Hz - 200 Hz
~ These freq. are not commonly attenuated or boosted (though do feel free to experiment). Instead, try using mid-side compression, as it can reign in the chaos of competing low-signals and make this region sound tight and uniform.

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100 Hz - 400 Hz
~ This frequency range is often responsible for a 'muddy' sounding mix. If your mix exhibits a mushy/muddy response, try using EQ cuts.

(Keep in mind that small EQ cuts with narrow Q values tend to yield more favorable results. Try it yourself to hear a difference!)

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400 Hz to 1.5 KHz
These frequencies often contribute to the 'body' of the song, and both compression and EQ can be employed to introduce punch and impact to the mix.

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800 Hz to 5 KHz
~ This range defines the clarity of the instruments. Small EQ increases or decreases applied in this range may pull out the fundamentals of many instruments, making them appear more defined.

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5 KHz to 7 KHz
~ These frequencies are commonly responsible for sibilance in a recording and can be removed with a parameter EQ set to a narrow bandwidth (a.k.a. Q value) to remove the problem frequencies or alternatively mid-side compression may be employed.

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3 KHz to 10 KHz
~ These frequencies are accountable for the presence and definition of instruments. Introducing 1 or 2 dB increases can augment the presence of some instruments, whilst cutting can reduce the effects of sibilance or high-frequency distortion.

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6 KHz to 15 KHz
~ These can contribute to the overall presence of the instruments and the 'air' surrounding the track. Introducing small gain/EQ boosts here will increase the brightness but may also boost noise levels.
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