Cables, if they’re in the same room as the speakers, will vibrate anyway…lifted or not, unless maybe they’re completely encased in venting ducts packed with spring loaded mattress foam (I’m selling those for $1,552 a linear inch). I won’t put little bridges under my cables because I think it’s simply another lame pseudo tweak, and vibration to a normal degree (earthquakes, nearby mortar explosions, and starting an unmuffled motorcycle near your rig all would qualify as "abnormal" vibration) does’t bother anything except the anal retentive brains of those who firmly think it does…do you realize there are cables in your speaker boxes being subjected to massive amounts of allegedly dangerous vibration? Those poor little defenseless wires saying "Hep me…hep me"...