NOTE: This is from a old thread (July 2010) on Future Producers.. I did not write this and to some extent agree with the information, so I copied and pasted for all to benefit.
To understand EQ and its intricacies you need hands-on experience, but to help you get started, here’s a table of general uses and the different ranges that EQ can affect. As every sound is different, though, these are necessarily very general guidelines…

Kick Drum
Any apparent muddiness can be rolled off around 300Hz. Try a small boost around 5-7kHz to add some high end.
50-100Hz ~ Adds bottom to the sound
100-250Hz ~ Adds roundness
250-800Hz ~ Muddiness Area
5-8kHz ~ Adds high end presence
8-12kHz ~ Adds Hiss
Snare
Try a small boost around 60-120Hz if the sound is a little too wimpy. Try boosting around 6kHz for that ‘snappy’ sound.
100-250Hz ~ Fills out the sound
6-8kHz ~ Adds presence














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