Rubidium atomic reference generator
For those refusing to accept compromises in audio quality there is the Isochrone 10M - a Rubidium Atomic Reference Generator based on real atomic technology. The 10M is designed specifically to appeal to the most discerning audiophiles and audio professionals.
The Isochrone 10M will only lose one second every 10,000 years. It is the most accurate clock available anywhere for audio or video.