K15 | Desktop DAC & Headphone Amplifier

High-end AKM DAC AK4497s x2

Discrete Class-AB transistor current-boosting headphone amplifier circuit

Two ultra-low phase noise femtosecond crystal oscillators

3000mW + 3000mW powerful output

DAC and headphone amp, streaming media, local playback

Fully-balanced audio circuit

3.93-inch touchscreen

Infrared remote control included

2.4G / 5G dual-band Wi-Fi + Gigabit Ethernet

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.

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. The 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

USB DAC: XMOS 16-core UX316, supports 768kHz/32bit, DSD512, MQA full decoding

Bluetooth Decoding: Supports SBC/AAC/LDAC and other codecs

Coaxial Decoding: Receives optical signal input, acting as an optical decoder

Single-ended Line Input: Receive single-ended analogue audio input, amplifying it with the K15

Balanced Line Input: Receive balanced analogue audio input, amplifying it with the K15

Streaming Media: Enjoy a wide variety of streaming media sources through Roon Ready and AirPlay

Local Playback: Supports USB external storage, allowing you to listen to your private collection

Fully Balanced Audio Circuit
From DAC decoding, low-pass filtering, gain control, and 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 analogue 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.

85~305VAC - Ultra-wide input voltage range

-40°C#85°C operating temperature

500,000 hours - Ultra-high reliability

Separate Digital and Analogue Section Power Supplies
Such a design helps to effectively avoid crosstalk between the digital and analogue sections of the audio circuits by ensuring better power isolation and improved anti-interference abilities.

Multi-stage Analogue Power Supply
The analogue section features a precisely-segmented multi-stage power supply, including stages for digital-to-analogue conversion, LPF, and transistors. The power supply utilizes up to 14 low-dropout linear regulators.

Precisely Restored Signals, Every Last Detail Heard | 2 Accusillicon Low Phase Noise Femtosecond Audio Crystal Oscillators
Inside the K15 is the industry-leading accusilicon ultra-low phase noise AS318-L crystal oscillator (45.1584 Hz, 49.1520 MHz) 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 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 Mmicro-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 240 MHz. 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.

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.

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.