Cones vs. factory spikes?

Marsh, be assured that my speakers do not move (except when I want them to :)). I'm expressing my surprise to the suggestion of Aurios and/or Roller Blocks under the speakers - which, in my opinion, will cause the speakers to move. I'll stay with spikes.

My common sense tells me that a speaker cabinet being "pushed" in the opposite direction by the excursion of a driver isn't a big deal - a tiny loss of amplitude. But when a speaker that is wobbly or mounted on an insufficiently stiff support recovers its "neutral" position following this push, that's probably when a mess is created, since that recovery motion is independent of and out of phase with driver motion. Roller bearings might be good under speakers if they keep the small, reactive motion of the cabinet in time with the driver motion. And, a speaker cabinet that is free to move as a unit on bearings in reaction to driver motion may not be prone to flex and resonate as much as a cabinet that is being held in place by just one of its surfaces. Also, spiking a cabinet to the floor means the behavior of the floor has a chance to affect the sound of the loudspeaker, another factor that bearing supports may alleviate. I don't have any first-hand experience with bearing supports, but I speculate on some possible advantages just to illustrate why simple, general rules (always spike to the floor, always mass load, etc.), though appealing, may not offer the best guidance for any particular situation.

I have not found any universal rules in this area, and it seems to depend on a number of factors. For example, with the hybrid Logans, rigid coupling to the floor is critical or the bass unit does not integrate at all well with the panel. But with very hard floors, or where you need metal cups under your spikes, then spikes can sound horrid - BDR cones being much better.