Unlike the relatively quiet environment enjoyed by analog electronics, digital audio equipment is inherently noisy. Digital timing clocks running at high enough speeds to mirror those of radio transmitters is a serious technological challenge when the goal is a quiet, jitter-free digital audio output stream. Engineers have worked for years with shielding and advanced grounding technologies in an effort to keep noise levels at legal levels (let alone quiet levels). The most effective means of removing noise is by physically distancing noisy components from quiet ones and most important, electrical isolation. The standard means by which digital audio subsystems are interconnected is by the use of wires in the signal and power paths. These interconnecting media radiate high frequencies throughout the circuit and make noisy environments worse. PS Audio's solution is to both physically and electrically isolate PST's output stage: no wires, no ground connections, no common power supply interactions. Inside PST there are two completely separated power supplies: one for the noisy electronics, a second for the quiet output stage. Signals are transferred by a form of focused beam short-wavelength radio signals between the two boards. The results are spectacular. With PST playing your discs, musical information once hidden by noise and jitter are free to come to life.