My Mic sounds bad...

I've got a late 2011 MBP and I'm using a BLUE Snowball. I can get the mic to work just fine as far as settings go, in both Mountain Lion & Bootcamp. My problem is the quality. I get terrible feedback, no matter how low I turn the gain or the headphone volume.

I've had the mic for about 3 years now, and feedback was never an issue with my old Toshiba. I'm starting to wonder if some aspect of the aluminum unibody, the USB ports themselves, or other hardware factor is causing 'interference.'

Not sure there's much else I can say about it...