I have a Roland Cube 30 right now, under warrenty, and have had to take it in to get the chassis tightened because it rattled when i played to much bass. Has anyone who has a cube 60 had the same problem that I have had on my cube 30??? Also, what do you think of the overall sound?? Im looking for a big enough amp that i can play in a medium sized room with my brother who plays drums and still be able to be heard.