If your action is very low (ie the strings are very close to the fretboard) it'll lead to buzzing of the strings against the frets. Test the head tension pressing on it, and if there's any slackness then try tightening the head by tightening each nut in order by a quarter of a turn. Check again and repeat if necessary, checking for buzzing each time. Don't over-tighten or you'll frighten the life out of everybody when the head explodes.
If the head's tight and you've still got a buzz - try a higher bridge, possibly obtainable online from Stewart MacDonald.
Ray