Cable vibration is going to happen even if you put them on little stands (internal vibration? really?), and it is a part of Audio Mysticism to think vibrating cables have any effect on the sound of things (seriously…give it some thought) especially when you consider what happens once the cable reaches the vibrating speaker from which it actually hangs. It is gonna Feel the Groove so to speak, to say nothing (or to say something I suppose) about the fact that the crossover and its little important bits are generally INSIDE the speaker being subjected to serious vibrational mayhem…again…give it some thought as, amazingly, audio still has room for logic.