I was doing a set with a band one time, and was getting nothing of my voice in the monitors, and later I was told, nothing much in the mains. I kept asking for some vocal in the monitor, but the sound guy appeared helpless. After the set I mentioned it to the sound guy, and he says "your voice is too "low" (as in pitch). You need to sing "higher" to come through the system well." This is a system with a 32 band eq, mind you . Later I checked the eq; bottom end, about 7 - 10 bands worth, all notched out. sb