Brainstorming here ... Some recent combos I've seen (Eden, Ampeg, Ashdown, etc.) have their power sections mounted in the rear of the enclosure, with the controls facing upward. This got me to thinking: why can't separate head units -- Class D ones, anyway -- be run in the same position? I'm thinking this because I plan on switching from a 2x12 to a pair of 2x10s soon to facilitate more on-stage options: vertical stacking or stage splitting, of course, but also using one as a kick-back monitor in venues with a decent PA, or one vertically but kicked back some for small venues. The problem with a kick-back setup is there's no stable flat place to place the head except on the floor, where it's in danger of being kicked, something being dropped on it, or worse. So why not run it, say, in a rack case sitting upright on the stage -- either sideways with the controls facing the stage front or (like those combos) vertically with the controls facing up? The latter would require a hole in the side of the case to run cables through ... or, run the head on the floor with the pedalboard on top of the case?