Noise in audio recordings?

I am recording from a Shure SM58 into a Peavey PV6 USB connected to my Mac. There is a static noise in the recording because I have to turn the gain up so much to hear the microphone. It is however connected via an XLR to 1/4 inch, if I got an XLR to XLR cable would I have to turn the gain up so much? Thanks, Oliver