When it comes to moving, I've seen more damage occur keeping a speaker in the upright or side position... overall, I prefer a speaker to be laid on its back.... Standing up or sideways, when a speaker is jarred or dropped, is when a voice coil shift occurs... this is the typical damage that I've seen rather than cabinet damage.. handled face down, if a jarring or speaker being dropped, it is possible, but unlikely that a coil could leave its gap. On its back, if its dropped a coil may bottom, but it typically won't cause damage to the driver.
I hope this helps, Tim
I hope this helps, Tim