Bill,

Are you singing through the keyboard? If so be sure the switch on the back is set to mic--not LINE.

Dave, I don't get any hiss at all with the 3K using the Crown 311 or Sennheiser, but this may have something to do with the way I have the mic EQ set.

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)