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The purpose of a spike point is not to "drain" energy. It is to keep energy from passing by creating a mechanical impedeance mismatch. It also couples the items together, therefore assists in mass damping. These things occur whether the spike is up or down. The reason why you usually see spikes points up between the stand and speaker is probably because the speaker is less likely to fall off the stand if it vibrates too much or is bumped. This is not a problem for the spike between the stand and the floor (or between a floorstanding speaker and the floor) because the spike is screwed right in to the base of the item on top.
the archives for lots of good information.
The purpose of a spike point is not to "drain" energy. It is to keep energy from passing by creating a mechanical impedeance mismatch. It also couples the items together, therefore assists in mass damping. These things occur whether the spike is up or down. The reason why you usually see spikes points up between the stand and speaker is probably because the speaker is less likely to fall off the stand if it vibrates too much or is bumped. This is not a problem for the spike between the stand and the floor (or between a floorstanding speaker and the floor) because the spike is screwed right in to the base of the item on top.