How to delete system preference on Mac Mini OS X 10.9.2

I purchased a Plantronics Gamecom 780 headset awhile ago. I can hear through it just fine however the mic has huge amounts of static. I know the headset should work on Mac. Ive tested it on other computers and it works perfectly. I believe that its just a corrupt system preference file but I don't know how to find it and delete it on this computer. Before you say anything, yes I have unmuted it, Ive gone into system preferences and than sound to mess with it in there.

http://www.macworld.com/article/2155980/os-x-10-9-3-unhiding-the-users-folder.ht ml
https://discussions.apple.com/message/24942345#24942345

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