75W toroidal
A low-noise transformer with a grain-oriented core and minimal magnetic leakage.
FIIOLINEAR POWER SUPPLY
FiiO Darkside Pro Low-noise regulated linear power supply - SILVER (Missing some accessories)
Clean power, serious headroom.
A regulated linear power supply with a 75W toroidal transformer, 12V/15V output at 3A and a discrete regulator circuit.
Regular price
£75.41
£139.99
Save £64.58
Unit price
Order now for next day delivery, with you by Tuesday 27 October.
Clearance product Full manufacturer warranty
Some of the original accessories are missing. It has been checked and works as it should. Not included with this unit: Spare Fuse. No cosmetic marks unless stated. Full manufacturer warranty.
The original retail box, in good condition (it may have been opened).
The printed guide or manual is included (where the maker supplies one).
Checked and tested by our team: it works as it should.
This unit: Missing Spare Fuse. Not everything is included. In the box shows exactly what you get.
It starts up and runs as it should.
THE AMP3 DIFFERENCE
Great gear. Even better service.
Order by 2pm, Monday to Friday, for next day delivery. Destination and stock availability apply.
Not sure it’s your perfect match? Talk to an audio specialist
FiiO Darkside Pro Low-noise regulated linear power supply - SILVER (Missing some accessories)
A little extra. A better pairing.
Better together.
Hand-picked pairings for this product. Choose one — we'll add them together.
MEET THE Darkside
Clean power, serious headroom.
A regulated linear power supply with a 75W toroidal transformer, 12V/15V output at 3A and a discrete regulator circuit.
12V or 15V
Relay-switched outputs at 3A, fine-tuned by a precision potentiometer.
Discrete regulation
Dual MOSFETs in parallel, with a self-resetting overcurrent fuse.
A DEEPER DIVE
Inside the Darkside.
Condition: Missing some accessories
This unit: Missing Spare Fuse
What this means: Some of the original accessories are missing. It has been checked and works as it should. Not included with this unit: Spare Fuse. No cosmetic marks unless stated. Full manufacturer warranty.
The FiiO DARKSIDE PRO is a low-noise regulated linear power supply from FiiO’s DARKSIDE power purification series, made to give your hi-fi system an ultra-silent, pitch-black background so the music shines through. It replaces the switch-mode adapter of many FiiO desktop DACs, amplifiers and players with a clean 12V or 15V at up to 3A, from an audiophile-grade 75W toroidal transformer and a fully discrete regulator, with output noise as low as 17µV.
An audiophile-grade 75W toroidal transformer
Designed specifically for low-noise audio, the toroidal transformer uses a grain-oriented silicon steel core for higher efficiency and lower eddy currents, and a seamless, fold-free winding for a uniform magnetic field and minimal magnetic leakage. With 75W in reserve, it handles highly dynamic transients with ease, for solid bass extension and a vivid, clear soundstage.
A fully discrete NMOS regulator
Two high-current IRFZ34N MOSFETs work in parallel to lower internal resistance, improving dynamic range and preserving every nuance of the music. With a fully discrete regulator circuit and a high-precision LT431 reference, the DARKSIDE PRO achieves ultra-low noise (17µV at 12V and 30µV at 15V, A-weighted) and a lightning-fast transient response, while keeping heat down. A relay switches the transformer’s output to match the 12V or 15V setting precisely, which maximises efficiency and greatly reduces heat.
Audiophile-grade components
A Japanese Shindengen D15XB60 bridge rectifier runs cool and stable, reducing micro-interference from current fluctuations. Five ELNA and seven Rubycon filter capacitors and two WIMA film capacitors filter out power-supply noise, and the DC cable uses monocrystalline silver-plated copper to cut transmission loss and shield against electromagnetic interference.
Precise and protected
A three-LED display shows the output voltage, and a precision potentiometer on the back lets you fine-tune it (by ±0.2V) with a small flat-head tool if the reading drifts. A self-resetting fuse protects against overcurrent, and a 1A/250V input fuse protects the mains side.
A minimalist aluminium chassis
The heavy unibody aluminium case shares the minimalist design of FiiO’s K13 series. Its weight and metal construction suppress resonance and block electromagnetic interference, cooling grilles keep it running cool, and it stacks neatly with other FiiO desktop units for a tidy, unified system.
Which devices it powers
FiiO lists the FiiO K11, K11 R2R, K13 R2R, K15, K19, R9, R7, TT13, the K5 Pro and K7 series and Q7, and FiiO portable players powered through USB-C, using a DC to USB-C adapter made for the DARKSIDE PRO (sold separately). Always set the 12V/15V switch to suit your device before connecting it.
| Transformer | Toroidal, 75W |
|---|---|
| Regulator | Fully discrete, 2 × IRFZ34N N-MOS in parallel + LT431 reference |
| Rectifier and capacitors | Shindengen D15XB60 · 5 ELNA + 7 Rubycon filter capacitors · 2 WIMA film capacitors |
| Output | 12V or 15V DC (switchable), 0–3A · GX16-2 aviation socket · ±0.2V fine-tuning |
| Noise | ≤17µV (12V) · ≤30µV (15V), A-weighted |
| Input | 220–240V or 100–120V AC (check the label) · 1A/250V fuse · self-resetting overcurrent fuse |
| Size and weight | 188 × 188 × 42.3mm · about 2.2kg · black or silver |
Good to know
- The 12V/15V switch must match the voltage your device needs; check its manual or rating label first.
- Before connecting to the mains, check that the input voltage on the label matches your supply.
- For a smaller supply, see FiiO’s PL50.
- In the box (this unit): FiiO DARKSIDE PRO, DC power cable, AC power cable and Quick start guide and warranty card.
In the box
- FiiO DARKSIDE PRO
- DC power cable
- AC power cable
- Quick start guide and warranty card
Downloads
THE FINER DETAILS
Built for
better listening.
Know what you’re choosing.
Find the right fit for your setup.
- Design
- Toroidal 75W transformer · Shindengen D15XB60 bridge rectifier · fully discrete dual N-MOS (IRFZ34N) regulator + LT431 reference · 5 ELNA, 7 Rubycon and 2 WIMA capacitors
- Compatibility
- FiiO K11, K11 R2R, K13 R2R, K15, K19, R7, R9, TT13, K5 Pro and K7 series, Q7, and FiiO portables with USB-C power (adapter sold separately)
- Size (H × W × D)
- 42.3 × 188 × 188mm
- Weight
- 2200g
- Power
- Mains in (220–240V or 100–120V) · DC out 12V or 15V, 0–3A, GX16-2 aviation socket
Specifications are based on manufacturer information and may change.
FROM FELLOW LISTENERS
Customer reviews.
Be the first to share your experience.
There are no customer reviews for this product yet.
GOOD TO KNOW
A little clarity.
A confident choice.
Something else on your mind?
How does free delivery work?
Every UK order has a free delivery option, and orders of £50 or more qualify for free next day delivery. Order by 2pm, Monday to Friday, for next day delivery; orders placed after 2pm, at the weekend or on a bank holiday are dispatched on the next working day. Stock availability and destination also affect arrival — check the options shown at checkout.
Pre-orders ship when stock arrives; the next day service starts after dispatch. Full delivery information
What if it’s not right for me?
Return within 14 days for any reason, or within 30 days if faulty, with free return postage. See our full Returns Policy for conditions and how to start a return.
Can you help me choose headphones?
Absolutely. Tell us what you listen to and the headphones you have — or the ones you’re considering — and we’ll help you find a suitable pairing. Chat with us
How do I request a Price Beat?
Use the Price Beat option on this page to send us the competing offer. The team will review your request; it isn’t an automatic discount. How Price Beat works
KEEP EXPLORING
