Vibration caused by sound waves is easily coupled into mechanical and electrical devices. Cables, vacuum tubes and even solid state circuitry all absorb sound energy, which in turn contributes to a variety of distortions and colorations.
The solid, machined case of the Audiophilleo1 and Audiophilleo2 gives a high degree of immunity to sound-induced distortions, even at high dBs: output jitter is not effected even by "power music".