Remember that a lot of the "resonance" you hear when you are singing is literally inside your head. You are also hearing the effects of the room in which you are singing. Note the difference between singing in a loaded closet versus a bathroom. Close-miking your voice will cut out most of the room effect, leaving you with just your unadorned voice. You will probably want to sweeten it with a touch of reverb and maybe a little delay to put back that resonance you hear when you sing.

Generally, if you can hear the effect, it's too much. Try dialing it up until you notice it, then gently dial it back until it's no longer apparent. That will probably be about right.

Jeff