Alright, here's the story. I've got an ampeg svt4-pro head that I recently placed in an skb 6 space rack. Previously, I simply carried my svt around loose, and would place the amplifier atop my speaker stack. The svt4-pro has the coolong vents on its sides, just a small vent at the back. When I didn't have the amplifier racked, it never even got warm. Obviously, the airflow was good out in the open. Now that its racked, and the airflow obstructed by being in a case, the amplifier heats up considerably more. Should I be worried? Do they make a case with removable sides?