Has anyone noticed a strong vibration comming from the rear panel of their imperial when playing songs with stronger bass?  I noticed this the other day while leaning up against it and i was thinking more bracing should go in to help stiffen this up.  Ever since i constructed my imperial, i felt that the rear panel was going to be a weak point because it has such a large surface area.  Would more bracing, perhaps on the back of the imperial, stiffen up the back pannel and help with this vibration?

My bad


       -Geoff