I stumbled on the following information related to vocal eq settings....

• General: Roll off below 60Hz using a High Pass Filter. This range is unlikely to contain anything useful, so you may as well reduce the noise the track contributes to the mix.
• Treat Harsh Vocals: To soften vocals apply cut in a narrow bandwidth somewhere in the 2.5KHz to 4KHz range.
• Get Brightness, Not Harshness: Apply a gentle boost using a wide-band Bandpass Filter above 6KHz. Use the Sweep control to sweep the frequencies to get it right.
• Get Smoothness: Apply some cut in a narrow band in the 1KHz to 2KHz range.
• Bring Out The Bass: Apply some boost in a reasonably narrow band somewhere in the 200Hz to 600Hz range.

Additionally, if you have singers with slightly wavering voices or young singers - teenagers, you can add a little vocal reverb effect that will even out their vocal fluctionations.

Maybe it's something deep within our minds that says "if there is a problem with the sound then we need to boost the problem area.  However, when it comes to EQ and even cross-channel balancing, this is not always the case. 

Cutting frequencies is often the cure.  For example, if two instruments are sharing common frequencies and you want one to stand out, don't boost the frequency for that instrument.  Cut the frequency of the other.  Lowering other channel volumes can bring the boost to the single channel that you need.  Louder isn't always better.