FiiO K15 Silver

Main Features
Two AK4497S VELVET SOUND DAC chips
Discrete Class AB transistor amplifier with 3000 mW + 3000 mW output power
Fully balanced audio circuitry from input to output
Supports USB DAC (768 kHz/32 bit), DSD512 and full MQA decoding
Bluetooth decoding with LDAC/AAC/SBC 
10-band PEQ equalizer support for all digital inputs
Dual master clock, Accusilicon crystal oscillator with extremely low phase noise
Multi-core X2000 processor and ESP32-S3 MCU for a fast and smooth user experience
Supports USB storage playback, Roon Ready, AirPlay streaming
Supports Wi-Fi 2.4/5 GHz and Gigabit Ethernet
Advanced thermal design and physical separation of power, digital and analog boards
3.93-inch touchscreen
Infrared remote control
Hi-Res Audio 

The FiiO K15 is a top-of-the-line desktop DAC and headphone amplifier that combines modern digital decoding and analog precision.

Two high-quality AKM DAC AK4497S
The K15 is among the first devices to utilize two of AKM's new high-end AK4479SVQ DAC chips with enhanced "VELVET SOUND" audio technology. These chips offer low distortion, a wide dynamic range, and an extended signal bandwidth with low power consumption. Rich detail is preserved in both the low and high frequency ranges, ensuring a natural and immersive sound experience.

VELVET SOUND is a brand that embodies the sound philosophy of the new generation of AKM audio products. It aims to achieve "realistic sound reproduction" through the full utilization of audio technology, providing an authentic and immersive sound experience without compromise.

Class AB transistor current amplifier circuit for headphones
The K15 features a carefully engineered discrete headphone amplifier circuit with an OP + transistor current amplifier design. A complementary pair of classic ON Semiconductor MJE243G/253G delivers high current and low impedance. This discrete circuit can achieve a symmetrical output power of up to 3000 mW + 3000 mW, allowing the K15 to effortlessly drive both full-size headphones and in-ear monitors—for smooth, natural, yet melodious sound.

Eight operating modes
Streaming media: Enjoy a variety of streaming media sources via Roon Ready and AirPlay*.
Local Playback: Supports external USB storage** so you can listen to your private collection.
Single-ended line input: Receives single-ended analog audio inputs and amplifies them with the K15.
Balanced Line Input: Receives balanced analog audio inputs and amplifies them with the K15.
USB DAC: XMOS 16-core XU316, supports 768 kHz/32 bit, DSD512, MQA full decoding***.
Bluetooth decoding: Supports SBC/AAC/LDAC and other codecs.
Optical decoding: Receives optical signal inputs and acts as an optical decoder.
Coaxial decoding: Receives optical signal inputs and acts as an optical decoder.

*Roon Ready certification is in progress, please pay attention to the official announcement from FIIO.
**The maximum current output of the USB-A port is 500 mA and is suitable for USB flash drives. If you want to connect a portable hard drive, you will need a separate power adapter.
***Full MQA decoding is only available with USB input and EQ=OFF. MQA is not available in bypass mode and with EQ=ON.From DAC decoding to low-pass filtering, gain control, and headphone amplification, the K15's audio circuitry is fully symmetrical. This design ensures a wide dynamic range while effectively reducing crosstalk, minimizing noise, and improving audio output quality.

Physically separate boards
The internal power supply, digital, and analog sections are each located on separate circuit boards, physically preventing crosstalk. This effectively ensures the precision and integrity of the processed audio signals and delivers pure, high-quality sound.

DC/AC dual power supply
The K15 features an integrated, next-generation, low-noise, high-efficiency, long-life 30W (12V-2.5A) industrial-grade power supply. The K15 also supports external DC power supplies*, allowing it to be powered by higher-performance