The housing will feel the opposite motion as the transducer, because of Newton's 3rd law. We typically do not want this, because this both takes energy away from the diaphragm (which is what transmits that energy to our ears) and worsens the performance of said diaphragm. Just because you feel vibration with your hands does not mean it was part of the design. Putting the headphones on your head mechanically couples the housing to your (supposedly much heavier) head, making it a larger mass system which will lower to resonances. Clamping pressure and pads will alter the amount of mechanical coupling. If you prefer the sound of the Abyss floating rather than on your head, I'm 96% certain it has nothing to do with the housing vibrating and more to do with the acoustic properties of sealed earpad/earside chamber.