Mic recording different from direct speakers

Hello everybody!
I am new to this beautiful forum!
I am only a novice with audacity, so I post my first problem.

I am tring to register audio voicetrack for songs. I have a entry level condenser microphone, the Tonor pro with echo effect integrated.
Thi is attached to the pc through the standard 3,5 jack.
When I listen the voice directly with the speakers or the headphones, It looks pretty good. All the audible frequencies are reproduced directly. and very well.
But after recording many frequences disappear (especially the bass frequencies) and the voice sometime appears distorced. :astonished:

What is the reason? :confused:

[u]This page[/u] may help.

Thank yoy DVDdoug!
That was the probem! Now the mic works perfectly!