FiiO DARKSIDE PRO: ultra-low-noise 12V/15V linear power supply

The FiiO DARKSIDE PRO is a high-performance linear power supply designed to upgrade compatible audio components and reduce electrical noise in your system. With a 12V or 15V nominal output and up to 3A output current, it’s a robust solution for hi-fi setups where cleaner, more stable power can translate into a quieter background, improved focus, and better control.

Hi-fi engineering: toroidal transformer and premium parts

To ensure stability and performance, the DARKSIDE PRO features a 75W toroidal transformer, bridge rectification (D15XB60-7000), and regulation based on dual parallel N-MOS with an LT431 reference. Filtering is handled by ELNA capacitors, supporting consistent power delivery for demanding systems.

Very low ripple and voltage status indication

A key highlight is ripple (residual noise) ≤ 30 µVrms (A-weighted), helping minimize interference. For everyday usability, it includes 3 status LEDs to display the voltage, making it easy to confirm operation at a glance.

Solid build and universal mains support

Weighing around 2200 g and measuring 188 × 188 × 42.3 mm, the DARKSIDE PRO is built to feel stable and substantial. It supports 220–240V and 100–120V mains input and includes a 1A / 250V fuse for protection.

Who is the FiiO DARKSIDE PRO for?

This linear PSU is ideal for:

- Hi-fi users looking to reduce noise and improve power stability
- Systems with DAC/streamer/preamp compatible with 12V/15V external power
- Demanding setups where power upgrades can be audible

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