I have posted a few times already about issues with rattling and buzzing noises in my cab, and I've been able to fix most of them. I put some foam inbetween the wood and grill and it stopped the rattle, I replaced the Velcro fasteners and that stopped the corner rattle. But even with the grill off I am still hearing a noise from the lower right portion of the cabinet. I originally thought it was the walls and fan shaking like usual but It seems to be coming from the cab. And it only really makes the noise when I am playing lower notes or low E or E on the A string. Cab is an early 90s svt 15e cab USA made. I don't really know what to do at this point, except see if the local guitar repair shop does speaker cab repairs. I can take a pic when I get home if it helps. I'm just not really sure what the best course of action is to take.