I know there have been some threads on this, and I did some searching but haven't really gotten the info I'm looking for. I picked up a used but minty Rumble 40 from a pawn shop for 100 and change to use for a couple of weekly rehearsals where I dont want to haul out my Berg cab and Demeter head. Its loud, and as light as an empty cardboard box, but obviously the tone is nowhere near as inspiring as the rig I'm used to. I'm wondering if there would be any inexpensive things I could do to make it sound a little better for rehearsal purposes. Not expecting anything earth shattering, but I'd be interested in knowing if anyone has driver replacement recommendations that would be a no brainer, or if anyone has done some bracing reinforcement to the baffle or beefed up the dampening on the inside, or anything that is cheap, easy and effective way to make a Rumble 40 sound considerably better. thanks!