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FiiO K15
*Pictures are for reference only. The real product may vary.
Leading the new ‘core’ generation Dual high-end AKM DAC AK4497S
The K15 is among the first to use two of the new high-end AKM DAC chips, AK4479SVQ featuring the upgraded 'VELVET SOUND' audio technology. The chips achieve low distortion, a wide dynamic range, and extended signal bandwidth, all at low power consumption. Rich detail is retained in both low and high frequencies for a natural and immersive sound experience.
VELVET SOUND is a brand that embodies the sound philosophy of AKM’s new-generation audio products. It aims to achieve 'true-to-life sound reproduction' by fully utilizing audio technology, delivering an authentic and immersive acoustic experience with no compromises.
*Trademarks is the property of AKM
Discrete architecture
Class-AB transistor current-boosting headphone amplifier circuit
Within the K15 is a carefully designed discrete headphone amplifier circuit, featuring an OP + transistor current-boosting design. A complementary pair of the classic ON Semiconductor MJE243G/253G delivers high current and low impedance output. This discrete circuit can achieve balanced output power up to 3000mW + 3000mW, allowing the K15 to effortlessly drive both full-sized headphones and in-ear monitors - producing smooth, natural, yet melodious sound.
Eight operating modes
*The max current output of the USB-A port is 500mA, suitable for USB flash drives. If you need to connect a portable hard drive, please connect a separate power supply for it.
Fully balanced audio circuit
From DAC decoding, low-pass filtering, gain control, and to headphone amplification, the K15’s audio circuit is a fully differential design. Such a design ensures wide dynamic range while also effectively reducing crosstalk, minimizing noise, and enhancing the quality of audio output.
Physically separated boards
The internal power supply, digital, and analog sections each lie on separate physical boards, physically preventing crosstalk. This effectively ensures the precision and integrity of processed audio signals, for pure and quality sound.
Precisely designed power supply
DC/AC dual power supply
The K15 features a built-in next-generation 30W (12V-2.5A) low-noise, high-efficiency, long-lasting, industrial and instrumentation-grade power supply. The K15 also supports external DC power supplies*, allowing it to work with higher-performance linear power supplies for even higher sound quality.
*12V-2.5A external DC power supplies are supported
85~305VAC Ultra-wide input voltage range -40°C~85°C Operating temperature
500000 hours Ultra-high reliability
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.
Multi-stage analog power supply
The analog section features a precisely-segmented multi-stage power supply, including stages for digital-to-analog conversion, LPF, and transistors. The power supply utilizes up to 14 low-dropout linear regulators to ensure a continuous supply of stable and pure power.
Precisely restored signals Every last detail heard
2 Accusilicon low phase noise femtosecond audio crystal oscillators
Inside the K15 is the industry-leading ACCUSILICON ultra-low phase noise AS318-L crystal oscillator (45.1584MHz, 49.1520MHz) that effectively reduces phase noise interference in audio signals. This ensures precise reproduction of audio signals at various sampling rates, for purer and more stable sound.
High-end parts,All for sound
8 ruby film capacitors + 32 wafer resistors
Low temperature drift, low noise, mean stable sound quality in both hot and cold environments.
2 Nichicon 3300uF audio capacitors + 4 ELNA MILIC II capacitors + 8 ELNA RA3 audio capacitors
Higher quality sound with a better soundstage.
High-quality Beryl capacitors
Ultra-low ESR, strong anti-interference abilities, for a stable and pure power supply.
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.
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.
Wired or wireless
Always a stable connection
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.
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
Dealers selling FiiO near you
FiiO K15 — feature-rich desktop DAC/headphone amp
The FiiO K15 condenses flagship tech into a compact, desktop all‑in‑one that balances power, resolution and streaming features. Its sonic hallmark is a rich, organic midrange and clear, low‑distortion top end driven by dual AKM AK4497S DACs and a fully balanced signal path, yielding excellent separation and detail. A discrete Class A/B amplifier supplies high current (up to 3000mW balanced) so it easily drives sensitive IEMs and demanding over‑ear headphones while preserving dynamics and a low noise floor. Internals use a tri‑board layout and isolated rails for stability, and the 3.93‑inch touchscreen, Wi‑Fi/Ethernet, Roon Ready and app EQ make it a versatile hub. Reviewers from ecoustics, Audiophilepure and Soundnews highlight its performance-to-feature ratio, making the K15 an attractive choice for desktop audiophiles seeking a single-box solution.
Pros
- Rich, immersive and highly resolved sound with low distortion and broad dynamic range.
- Powerful Class A/B amplification (claimed up to 3000mW balanced) that can drive both sensitive IEMs and demanding over-ear headphones.
- Exceptionally well-featured: touchscreen, dual-band Wi‑Fi/Ethernet, Roon Ready, Bluetooth codecs and a 10-band parametric EQ via app.
- Very low noise floor and clean background enabled by tri‑board layout and isolated power rails.
&
Cons
- Soundstage width/size is not as expansive as some top-tier desktop systems (stage size rated 83/100 by Soundnews).
- Positioned above bare‑bones amp alternatives, so buyers focused solely on amplification may find cheaper options that trade features for lower cost.
Sound Quality
92/100
Multiple reviews highlight strong dynamic performance and wide dynamic range (Soundnews Dynamics 91/100; reviewers note 'ultra-low distortion and wide dynamic range'). The discrete Class A/B amplifier delivering high current (claimed up to 3000mW per channel from reviews) is repeatedly praised for providing punch, headroom and lively transients across headphone types.
Noise Floor
91/100
Noise performance is repeatedly praised: Soundnews gives a Noise Floor 94/100 and other reviews call the design 'low-noise' and note the balanced path reduces interference. No reviewers report audible hiss, and the tri-board/isolated power rails are cited as helping achieve a very quiet background suitable for sensitive IEMs.
Headphone Compatibility
90/100
Reviews explicitly state the K15 can drive both sensitive IEMs and demanding over-ear headphones, citing up to 3000mW via the balanced output and high-current Class A/B stage (Audiophilepure, ecoustics). While output impedance numbers aren't quoted, reviewers test/claim suitability across a wide range of cans and emphasize balanced output and gain headroom for hard-to-drive planars.
Build Quality
91/100
Build and internal design earn praise: reviewers point to a tri-board layout separating digital, analog and power sections, independent rails and a linear transformer/Class AB topology (Audiophilepure, ecoustics, Soundnews Build Quality 91/100). The construction choices are credited with reducing crosstalk and improving stability, reflecting above-average desktop-class engineering.
Features Connectivity
95/100
The K15 is feature-packed: high-quality AKM-class DAC silicon, XMOS USB (768kHz/32-bit, DSD512, MQA), balanced output, Bluetooth LDAC/AptX HD, Roon Ready/AirPlay streaming, dual-band Wi‑Fi/Ethernet, a 3.93" touchscreen and a 10-band parametric EQ via app are all documented in reviews. That combination of high-end DAC, balanced architecture and network/streaming capability puts it at the top end of the connectivity/features band.
Value for Money
93/100
Reviewers frame the K15 as strong value for its capabilities (Soundnews positions it as the K17 trickle-down at a much lower asking price; ecoustics calls the $549/$599 pricing reasonable). Multiple reviews praise the balance of decoding, power, connectivity and a front display, describing it as an excellent/competitive option in its segment.
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