currently i'm running two r30s and a dayton sub off and old sansui amp. anyways everything was working fine until earliery today when i noticed sound stopped coming out of my right speaker. at first i though it was the speaker, but then figured out it was not. then i thought it was the amp's problem so i tried to play my xbox through it and everything worked fine. the rca to headphone cord i use is fairly new, but could that be the problem? or did something magically change on my computer's configuration that i can't detect?