Isolate, except as Elizabeth noted drain, for the speakers. Consider an acoustic screen in front of your components, in addition to 'moon gel' used as dampers.
Vibration Theory - Isolate or Drain?
Given that a CD Player or Transport has quite a bit of internally generated energy from the motor, is it best ti deal with vibration issues by coupling the player to a surface with spikes or cones? or decouple the player from the surface beneath it with spongy materials? Any consensus on the best approach here?