Digital audio players that handle small signals require thorough noise suppression because even the slightest noise can significantly affect sound quality. The Multi-Stage Silent Power Supply provides thorough noise suppression in three stages: (1) High-speed switching power supply, (2) low-noise regulator, and (3) current injection active noise cancelling.
The SL-G700M2 uses a high-speed switching power supply of approximately 300 kHz, which is also used for the analogue circuits of the SU-R1000 reference-class integrated amplifier. By increasing the switching frequency, the interference of noise on the music playback bandwidth is reduced and a highly responsive power supply is achieved.
The low-noise regulator also provides low noise at high level and stable power supply are realised with the fine tuning of circuit patterns.