As a rule, digital circuits require extensive regulation to reduce digital noise and phase noise, which if left unresolved, pollute the audio signal. They are also needed to meet the tight supply voltage tolerances required for optimum operation of digital circuits.

Most digital power supply sections in compact disk sources employ basic regulation stages that consist of one single chip regulator (even if many "one stage" regulators are used simultaneously). The resultant effective operating frequency range is only up to ~1kHz , thereafter losing regulation quickly above.

Bearing in mind that digital noise exists all the way into the GHz region and that audio signals reach up to 20 kHz but are influenced by ultrasonic noise of much higher frequencies, the result is a large amount of noise has not actually been suppressed. Still in abundance, digital noise is therefore still very much in existence, continuing to pollute the audio signal.

Understanding and appreciating that digital noise has a very wide frequency bandwidth range is critical. In the CD-77, rather than mindlessly repeating the same generic regulator chip in all positions, a total of 14 different but specifically designed regulators are employed.