FiiO K15 Desktop DAC and Headphone Amplifier - Silver

About: FiiO K15 Desktop DAC and Headphone Amplifier - Silver

K15 Desktop DAC and Headphone Amplifier

• High-end AKM DAC AK44975 x 2
• 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 WIFI + 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. 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

• USB DAC: XMOS 16-core XU316, supports 768kHz/32bit, DSD512, MQA full decoding*.
• Bluetooth Decoding: Supports SBC/LDAC and other codecs. (To be determined)
• Coaxial Decoding: Receives optical signal input, acting as an optical decoder.
• Coaxial Decoding: Receives optical signal input, acting as an optical decoder.
• Single-Ended Line Input: Receive single-ended analog audio input, amplifying it with the K15.
• ​Balanced Line Input: Receive balanced analog 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.
  • *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.

• 85~305VAC Ultra-wide input voltage range
• -40°C~85°C Operating temperature
• 500,000 hours Ultra-high reliability
  • *12V-2.5A external DC power supplies are supported

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

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 purepower 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

What's Included

• 1x K15
• 2x USB data cable
• 1x Headphone plug adapter
• 1x Remote control
• 1x XLR4 decorative plug
• 1x Fuse
• 1x AC power cord
• 1x Warranty card
• 1x Quick start guide