When extreme gains or cuts are required in an EQ, they can lead to harshness and phaseshift issues. One alternative is to use multiple moderate EQ bands:
Instead of: . . . . . . . . . . . . . . . . . . . . try this:
. . . . . . . .
http://i.imgur.com/bboCMPJ.png . . . . . http://i.imgur.com/r1WbSHS.png
