If your floor structure is a concrete slab on grade (dirt) i.e. it's well "grounded", there could be a very slight inductance built up depending on the actual configuration of your speaker cable, but due to the relatively low power in speaker cables, it would be so small as to have virtually no affect on signal transmission (sonics.)
As for damping, most high end cable makers (e.g. Purist Audio) go to great lengths to damp out any resonances or external vibration. I can't see why it would be desireable to preserve/encourage it.
As for damping, most high end cable makers (e.g. Purist Audio) go to great lengths to damp out any resonances or external vibration. I can't see why it would be desireable to preserve/encourage it.