Ok, What I did is ... carefully remove the speakers. Then carefully remove any insulation exposing the wood inside. Also remember how your speakers were wired so you don't panic when you put it all back together. Now get a good wood glue from your local hardware store. Get a big bottle!!! This process takes a little while but it works. Use whatever you have to lean the cab so the joints you are filling with glue are at the bottom, (Gravity) then apply the glue in the intersections of all the joints down in that position. This will allow the glue to seep into the cracks and build up in the corners. You can see this can take a little wile do to dry time and multiple flips of the cab to get all the angles filled. Check all your wiring and clean or replace your 1/4 inch jack. Good time to replace everything. after you are sure you have glued everything you can get to and the glue is dry, use some good spray adhesive to re install the insulation. Note: I left out the insulation on the last cab I did cause I thought it might be buzzing due to the fact that it had a hard backing surface that wasn't totally glued to all the wood surfaces. Then re install your speakers carefully. A slip of the screw driver can be costly. After a day or so, making sure the glue is set hard, plug in and try your cab without the grill on. If there is no buzz, try again with the grill on. If the grill buzz's get a few small wood screws and put one in each corner and in the middle of both sides. (6) total. If the heads are small they will disappear beneath the grill cloth. Some people don't like putting holes in there grill cloth and I understand so if you can do something else to stop the buzz I am all for it. My cabs are used every day and are not in collector shape. Thing is now they don't buzz and that was what I was looking for. Good luck and take your time.