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Circuit Design

An uncompromising circuit design focused on minimizing noise and maximizing transmission quality through extensive use of high-grade parts

Two independent circuit blocks

The circuits that power the main circuit board's system hardware and its storage devices are completely isolated to keep power supply noise from the latter from adversely affecting the former.
In this way, we have aggressively eliminated the effects on system circuitry of noise generated during drive access.

  • Power supply unit
  • System block
  • Power supply generation block for system block
  • Power supply generation block for storage devices

Single-point ground to prevent noise generation,
leakage, and introduction

Counteracting noise is the single greatest issue in the design of audio devices.
The HFAS1 features an optimized pattern design and a single-point ground configuration that grounds circuitry via a single connection to the unit's copper base.
This arrangement allows it to generate an exceptionally stable supply of power from which common impedance has been eliminated.

High-capacity electrolytic capacitors

The HFAS1's circuit board incorporates an optimal arrangement of low-ESR electrolytic capacitors that includes some audio-grade components.
This design implements a high-quality, stable power supply.


25 MHz low-phase-noise crystal oscillator

The HFAS1 uses a vacuum-type crystal oscillator with low phase-noise characteristics.
In addition to limiting clock jitter, this design implements high-precision network transmission using a clock generated by a high-precision crystal.


Link separation system

The HFAS1 provides two LAN ports, one for audio and one for networking.
The "for Audio" port is designed to be connected to a network audio player, while its "for Network" counterpart is designed to be connected to the user's home network, enabling the high-quality signal generated by the unit to be transmitted directly to the player.


LAN connectors with exceptional contact performance

The two LAN connectors have been oriented with the signal terminals at the top in order to ensure stable contact with the LAN cables' terminals.
In addition, the DIP-type LAN connectors used by the HFAS1 each feature a mechanically robust, 14-point connection to the circuit board.
This design prevents the connector and terminals from becoming misaligned in order to preclude any adverse effects from vibration.

LED-off function to counteract noise

The two LAN ports incorporate LED lamps that flash or illuminate continuously to indicate information such as the connection status and communications speed between the HFAS1 and other audio devices and the router. However, users can disable these lamps on the setup screen in order to minimize any noise resulting from their operation.

Power Supply

Two power units supply clean, stable power.

Dual high-quality,
high-reliability 50 W power supplies

Because the power supply plays a key role in enabling high-quality audio playback, the HFAS1 incorporates two dedicated TDK-Lambda 50 W power supplies (for a total of 100 W), one for the main unit and one for the drive unit. Use of independent power supplies for the system and storage blocks keeps noise from one block from adversely affecting the other.


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