Setting the EQ is an art, so allow time for experimentation and, if possible, watch an experienced sound engineer at work. Yet here are a few things to watch out for: if you are singing close to the mic, you are boosting your lower frequencies and this could cause you to sound muddy (in some venues). Try turning down the low and mid ranges a bit. If you then find that you want a little more clarity in the high end, you might try a little boost in the 3–6 kHz area; this will add a little “shine.” -from The Ultimate Guide to Singing