Another question for you experienced people out here in TB land. Anyone experienced any damage to their head/rack/effect units when using them sitting on top of speakers? I, as most bass players I know, set the rack unit on top of my stack. However given the new setup I have been using, which is a much more bass friendly cabinet, I am semi-concerned it might cause damage (vibration) to my effects and such in the rack. I'm not really worried about it vibrating off the stack because my current rack weighs a ton, but I was wondering what comments you all have on the matter.