Ignore the advice of GUEST,cwrd1ylion@hotmail.com to adjust the tensioner rod in the neck - if he's referring to the truss rod that goes the length of the neck, the only point in adjusting that would be to correct very small problems of curvature along the fingerboard - nothing to do with the sound. Too much adjustment could damage the neck. If he's referring to a coordinator rod, there's often two of these metal rods which cross the banjo body under the head. Adjusting these is only any use in correcting very slight action problems, and can easily result in damage to the body.

cheers
Ray