*Pictures are for reference only. The real product may vary.

SYLVANIA NOS PCF80 preamp tubes x2 | JJ ELECTRONIC EL34 power tubes x4

Class A push-pull output power up to 28W+28W | Custom high-bandwidth low-noise output transformer | Stepped high-precision analog potentiometer

Dual-channel LED-backlit mechanical VU meters | Four RCA analog audio inputs

4Ω/8Ω speaker outputs | 6.35mm single-ended headphone output

High-bandwidth low-noise output transformer

A powerful core, Unwavering output

No expense was spared in commissioning a custom EI silicon steel laminate output transformer. It is filled internally with epoxy resin and fine sand, then fully sealed within a robust transformer enclosure. This construction effectively suppresses transformer vibration, provides excellent electromagnetic shielding and moisture protection, while significantly enhancing overall stability and longevity. The result: a blacker background, tighter and weightier bass, and more refined treble—allowing both the music's finest details and most powerful dynamics to be faithfully reproduced.

Pure tube amplifier FIIO EA13

A Classic Reimagined, Bold Beyond Compare.

Three years in the making, a masterpiece finally arrives.

A reinvented design language for tube amplifiers—strikingly, refreshingly new. Six imported tubes, preserving classic design. Exceptional in every sense. As the warm glow of the tubes rises, vibrant lighting effects flow, and the mechanical meters gently dance. As sound and light intertwine, time slows, and the warmth of analog fills the air.

6 imported tubes

Naturally rich sound

Preamp voltage amplification: 2 SYLVANIA NOS PCF80 tubes, produced by one of America’s premier tube manufacturers—delivering refined, transparent sound with an open and natural soundstage.

Power amplification: 4 Czech JJ ELECTRONIC EL34 tubes, classic European power tubes—offering warm, full-bodied sound with pure, unmistakable tube character.

*Due to objective factors such as production batch variations, storage duration, and natural oxidation, the silk-screened markings on vacuum tubes may exhibit slight blurring, fading, discoloration, or even partial peeling. This is a normal and natural occurrence with vacuum tubes and does not affect their performance or sound quality.

Class A push-pull amplification, 28W+28W effortless output

Drawing on the classic circuits of renowned tube amplifiers from the golden era of the 1950s, combined with pentode mode and pure Class A operation, it effectively minimizes distortion. The result is a sonic signature that is delicate, dense, silky, and beautifully transparent.

Furthermore, the 28W+28W (8Ω) output is capable of driving most bookshelf speakers and even select floor-standing models, seamlessly combining exceptional refinement with authoritative control. From the subtle nuances of a performer's breath to the expansive soundstage of a concert hall, every detail is rendered with vivid, lifelike realism.

A distinct character

Power lying within

The EA13 is where modern design aesthetics meet classic acoustic principles—a bold reimagining of the tube amplifier: An aviation-grade aluminum CNC-machined front panel—thickened and sandblasted for a refined tactile finish that effectively suppresses resonance. A unibody chassis—clean and commanding in presence, solid in construction, with excellent electromagnetic shielding. Recessed tube mounting paired with an integrated protective cover delivers a sleek modern look without sacrificing safety. Side grille ventilation and vibration-damping feet round out a design where every detail serves the music.

Stepped high-precision analog potentiometer, Precise and reliable

Volume control is handled by a stepped high-precision analog potentiometer, offering 40-level fine volume adjustment, with precision resistors matched at every increment to ensure consistent left and right channel balance. Volume adjustment is accurate and dependable, eliminating the channel imbalance and wear degradation typical of traditional carbon film potentiometers.

Separate digital and analog

section power supplies

Such a design helps to effectively avoid crosstalk between the digital and analog sections of the audio circuits by ensuring better power isolation and improved anti-interference abilities.

Dual-channel stereo LED-backlist true mechanical VU meters, Sound made visible

Evoking a classic aesthetic, these true mechanical VU meters feature a warm retro backlight driven by a dedicated control IC. When the music starts, the needles dance in perfect harmony with your music. The music becomes not just something you hear, but something you can actually "see."

*The VU meter pointers may show a deviation of up to ±1mm at the zero position, which is within the factory specification tolerance. Slight misalignment between the left and right pointers when returning to zero is a normal manufacturing phenomenon and does not affect actual usage.

Audiophile-grade components,

All in service of good sound

Japanese NCC large-capacity filter electrolytic capacitors

A pure, clean power supply that lets the natural richness of tube sound come through.

High-quality axial metal film coupling capacitors

Low loss, low distortion, and exceptional stability.

High-end parts,All for sound

2 Nichicon 3300uF audio capacitors + 4 ELNA SILMIC II capacitors + 8 ELNA RA3 audio capacitors

Higher quality sound with a better soundstage.

8 ruby film capacitors + 32 wafer resistors

Low temperature drift, low noise, mean stable sound quality in both hot and cold environments.

sets of silver-plated oxygen-free copper interconnect wires

The various boards are connected with silver-plated oxygen-free copper wires to ensure high-fidelity signal transmission with minimal loss.

High-quality Beryl capacitors

Ultra-low ESR, strong anti-interference abilities, for a stable and pure power supply.

Dual master cores Stable and smooth experience

High-performance multi-core processor X2000: This processor is powered by a unique design featuring dual XBurst@2 cores + XBurst@0 micro-core, to deliver exceptional computing performance at ultra-low power consumption. This ensures precise audio signal processing, guaranteeing stable and smooth music playback.

Efficient MCU ESP32-S3: Integrated into this chip is a high-performance Xtensa 32-bit LX7 dual-core processor and an ultra-low-power coprocessor, featuring a clock speed of up to 240MHz. This chip enables precise system control for a highly efficient and fast user experience.

A harmonious fusion of square

and round Brilliance in design

The K15 features FIIO's signature design blending square and round elements, merging retro elegance with cutting-edge technology. Thoughtfully crafted for both functionality and aesthetics, it features convenient screen controls and multiple knobs for smoother operation. In addition, the grid structure enhances heat dissipation - all showcasing the brilliance of its meticulous design.

Touch control /Knob control /Remote control /FiiO Control App connection

10-band high-precision PEQ Unlimited fun

All digital inputs of the K15 support PEQ adjustment*. Precisely fine-tune the sound to your liking by simulating and modifying the frequency response curve of headphones, thanks to FIIO’s proprietary adjustment algorithm and interface.

* Digital inputs include USB, coaxial, optical, Bluetooth, streaming media and local playback. *Web PEQ location: Top bar of FIIO website – Support – Web-based PEQ settings

Multiple protection systems

Listen worry-free

Not only has the device gone through rigorous testing in FIIO labs, it also contains various protection systems that can intelligently detect abnormal conditions and take actions accordingly to protect you, avoiding damage to the machine.

The Gigabit Ethernet port supports fast and stable wired data transmissions, while the AP6256 Wi-Fi module supports 2.4G and 5G band wireless networks as another way to stably transmit lossless audio.

Wired or wireless

Always a stable connection

Independent Ethernet port, supports Gigabit wired network

Supports 2.4G and 5G band wireless networks

Wide variety of usage scenarios

Buttons and ports labeled

*Adjusting the equalizer via the webpage requires connecting to the RS232 port on the rear panel.

*The maximum output current of the USB-A port is 500mA, which is suitable for connecting to a USB flash disk. If you need to connect to a mobile hard disk drive, please use an extra power supply to power it!

Packing list

①----------------------------------------------K15*1

②--------------------------------AC power cord*1

③-------------------------------Remote control*1

④----------------------  XLR4 decorative plug*1

⑤-------------------------------------------    Fuse*1

⑥--------------------------------USB data cable*2

⑦-----------------  Headphone plug adapter*1

⑧-------------------------------- Warranty card*1

⑨-----------------------------Quick start guide*1