Depends on how deep your 6x9's are? With a 1/2 inch wood you should be okay. Your only concern, other than the depth, will be the metal bracket that the handle mounts through. It sits directly on the edge of the speakers and if they get much taller at all the bracket won't fit right. Two ways to fix this, cut a notch in the wood or cut a piece out of the bracket. What is the depth on your 6x9's anyway??