I just bought an 02 Xterra and I cant be any happier. The only problem I seem to be having is some slight buzz in one of my Subwoofers. The speaker dosent sound blown, but at a high volume and when the bass rings out, there is something there. I thought that it might be something else buzzing in the truck as a result of amount of bass but I'm not sure. Has anyone else experienced this? I dont feel like replacing my speakers if they arent broken.

Your signal wires could be picking up interference from another device. Is there anything installed in your X like satellite radio, CB, etc, etc?