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FIIO K17
Desktop headphone amplifier / DAC with 4000mW per channel.
DAC AK4191 + AK4499EX x2
7.84’ touch screen
Bluetooth 5.1 with aptX HD and LDAC
Supports MQA, DSD512 and 768kHz/32-bit PCM
Wi-Fi/Gigabit Ethernet
USB, coaxial, optical and HDMI ARC inputs
XLR, 4.4mm and 3.5mm outputs
Ultra-high gain for demanding headphones
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FiiO K17: Where Cutting-Edge Technology Meets Retro Design
The FiiO K17 is FiiO's next-generation amplifier/DAC, designed to deliver exceptional performance in a desktop format. With a unique combination of retro elegance and state-of-the-art technology, this device aims to set the benchmark for those who demand the highest audio quality in their headphones.
More than just an updated successor to the K9 Pro, the K17 explores new possibilities in high-fidelity audio reproduction, designed to maximize performance even for the most demanding headphones.
Exceptional Power and Performance
Inside, the FiiO K17 integrates a powerful M21586Q DSP chip, capable of executing 64-bit double-precision floating-point calculations, running at 360 MHz. This is complemented by an ES9821Q DAC and an ultra-low phase noise femtosecond crystal oscillator, specifically developed for maximum precision.
These components allow:
The use of a high-precision 31-band PEQ in any mode while maintaining complete audio signal fidelity.
Robust output protection, safeguarding both headphones and connected audio devices.
7.84” Touchscreen for Total Control
The FiiO K17 features a large 7.84” color touchscreen, bigger than many similar devices. With a customized version of Android 12 featuring a vertical display system, it is simple and intuitive to operate. From initial setup to detailed audio adjustments, every touch quickly leads to the desired result.
Class AB Discrete Headphone Amplifier
One of the key features of the FiiO K17 is its discrete amplification circuit for headphones:
Based on the classic ON Semiconductor MJE243/253 high-current transistor pair.
Provides an output power of 4000 mW + 4000 mW in balanced mode, nearly double that of the K9 Pro ESS.
Delivers smooth, natural, and wide sound, effortlessly driving both full-size headphones and IEMs.
Reference AKM DAC
At the heart of the K17 lies the iconic AKM chip combination:
AK4191 + AK449EX x2, with two AK4499EX dedicated to each channel.
8-channel to 4-channel configuration, optimizing separation and dynamics.
New architecture with completely separate digital and analog sections, combined with “DWA ROUTING” technology to minimize background noise and enhance resolution.
Eight Operating Modes for Greater Versatility
The FiiO K17 adapts to all your needs with its eight operating modes:
USB Decoding: With 16-core XMOS XU316, supports up to 768 kHz/32-bit, DSD512, and full MQA decoding.
Optical Decoding: Receives digital audio signals via the optical connection for subsequent amplification.
Single-ended Line Input: Processes and amplifies analog signals.
Streaming Receiver: Compatible with Roon Ready and AirPlay for easy and wireless music streaming.
Bluetooth Decoding: Powered by Qualcomm QCC5125 with Bluetooth 5.1, supporting aptX HD, aptX Adaptive, and LDAC.
Coaxial Decoding: Receives digital audio signals via coaxial input.
Balanced Line Input: Processes balanced analog signals to maximize the K17’s power.
Local Playback: Compatible with external USB storage devices and portable hard drives loaded with your music library.
Fully Balanced Design from Start to Finish
From the DAC to I/V conversion, low-pass filtering, and headphone amplification, the entire circuit of the FiiO K17 is fully differential. This maximizes dynamic range and minimizes crosstalk while using precision OP1612 operational amplifiers to ensure clear and powerful audio output.
Independent and High-Precision Power Supply
To prevent interference and noise, the K17 features separate circuit boards for digital, analog, and power sections.
Low-noise transformer: Provides clean and stable current.
Five 4700uF electrolytic capacitors: Ensure sufficient energy reserves for consistent power delivery.
Separate power supplies: Prevent crosstalk between digital and analog stages.
TPA7A47/7A33 LDO regulators: Provide stable, noise-free secondary voltage regulation.
Three Femtosecond Crystal Oscillators
The FiiO K17 integrates three ultra-low phase noise ACCUSILICON crystal oscillators (AS318-L and AS318-Pro), drastically reducing signal distortion. The result is a purer and more precise playback, regardless of the sampling rate.
Dual-Core Processors for a Seamless Experience
Inside the K17 is the X2000 multi-core processor, designed for high performance with low power consumption. Additionally, it features an ESP32-S3 SoC with a dual-core Xtensa LX7 processor running at 240 MHz and an ultra-low-power co-processor. This combination ensures stable playback and a fast, responsive interface.
Perfect Balance Between Retro and Modern
The FiiO K17's physical structure blends square lines with circular elements, creating a design that evokes a retro style without sacrificing modernity. Functional details such as the ventilation grille, which aids heat dissipation, and multiple controls for more intuitive operation have been implemented.
Total Control and Intelligent Protections
The K17 offers multiple interaction methods:
Touch controls: Direct operation via the 7.84” screen.
Remote control: Allows mode changes and equalizer adjustments without moving.
Five control wheels: Adjust volume, gain, and other parameters with precision.
Its architecture also includes advanced protections:
Headphone protection
Overheat protection
Transformer protection
Output overload protection
DC output protection
Input power overcurrent protection
Stable Connectivity: Wi-Fi and Ethernet
The FiiO K17 features a Gigabit Ethernet port for maximum data transmission speed. It also includes the AP6356 Wi-Fi module, supporting 2.4 GHz and 5 GHz networks for lossless audio and a stable connection.
What’s in the Box?
1 x FiiO K17
1 x AC power cable
1 x Remote control
1 x XLR4 plug cover
1 x Fuse
2 x USB data cables
1 x Headphone adapter
1 x Warranty card
1 x Quick start guide
FiiO K17: A High-Level DAC and Amplification Solution
Combining a retro design with the most advanced audio engineering, the FiiO K17 positions itself as the ideal option for those looking to elevate their listening experience. With a wide range of operating modes, high output power, and multiple protection systems, it is a standout choice for audio enthusiasts.
General Specifications
Name/Model: K17
Colours: Black/Silver
Dimensions: Approximately 244.6 x 213 x 66.8mm
Supports full MQA decoding
Ultra-high gain mode / Super-high gain mode /High gain /Medium gain /Low gain
3.93-inch (240 x 1020) bezel-free LCD display
Supports 31-band global PEQ (no PEQ processing on digital output)
Dual band 2.4G/5G WiFi support
Remote control: Infrared remote control supported (only the one included in the packaging)
USB decoding maximum supported sample rate: Up to 768 kHz/32-bit; DSD512 (native)
Coaxial input decoding: Up to 192 kHz/24-bit; DSD64
Optical input decoding: Up to 96 kHz/24 bits
Coaxial output: Up to 192 kHz/24-bit; DSD64
Optical output: Up to 192 kHz/24-bit
Streaming decoding: Up to 384 kHz/32 bit; DSD256 (DOP)
Local playback: Up to 384 kHz/32 bits; DSD256
Hardware solution SoC: X2000; MCU: ESP32-S3; DAC: AK4191EX+AK4499EQ*2; USB decoding: XU316; Bluetooth decoding: QCC5125; AMP: MJE243G/253G Discrete Transistor Current Amplifier Headphone Amplifier
Weight: 2.75kg
Bluetooth reception (5.1): SBC / AAC / aptX / aptX LL / aptX HD / atpX Adaptive / LDAC
Bluetooth reception (5.1): SBC / AAC / aptX / aptX LL / aptX HD / atpX Adaptive / LDAC
FiiO Link compatible
MCU firmware: Upgrade via the rear RS232 port
XMOS firmware: Upgrade via front or rear USB-C port
AC power supply 100-120V/220-240V~50/60Hz
Adaptive Impedance:
PO: 8~150Ω
BAL: 8~350Ω
Specifications ports
USB-A x 1 (data transmission port)
Balanced headphone output: standard 4.4 mm port x 1+ XLR4 balanced connector x 1
Headphone output: standard 3.5 mm port
Digital Optical Input Port: Optical Jack
Digital coaxial input port: RCA jack
Digital Optical Output Port: Optical Jack
Digital Coaxial output port: RCA jack
Balanced Line Output Port: Balanced XLR3 plug
Single-ended line output port: RCA plug
Balanced line input port: standard 4.4 mm port
Single-ended line input port: RCA plug
Slide Switch: Ground selector switch M4 banana plug housing ground terminal
Ethernet Port: 1000Mbps
TRIGGER IN port: standard 3.5mm port
Headphone output (6.35 mm output, USB DAC/coaxial decoding/optical decoding, ultra-high gain mode)
Output power 1: L+R≥1800mW+1800mW (16Ω, THD+N＜1%)
Output power 2: L+R≥1850mW+1850mW (32Ω, THD+N＜1%)
Output power 3: L+R≥240mW+240mW (300Ω, THD+N＜1%)
Output impedance:＜1Ω (32Ω)
THD+N:＜0,0005% (1kHz/-12dB@32Ω)
Crosstalk: ≥76dB (1kHz@32Ω)
Noise floor:＜5μV (A-weighted)
SNR ≥124dB (A-weighted).
Frequency response:
20Hz~20kHz: attenuation＜0.05dB
20Hz~90kHz: attenuation＜3dB’ Peak output voltage ＞24Vp-p
Headphone output (6.35mm output, USB DAC / coaxial decoding / optical decoding, super-high gain mode)
Output power 1: L+R≥1800mW+1800mW (16Ω, THD+N＜1%)
Output power 2: L+R≥1000mW+1000mW (32Ω, THD+N＜1%)
Output power 3: L+R≥120mW+120mW (300Ω, THD+N＜1%)
Output impedance:＜1Ω (32Ω)
THD+N:＜0.00056% (1kHz/-9dB@32Ω)
Crosstalk:≥76dB (1kHz@32Ω)
Noise floor:＜5μV (A-weighted)
SNR: ≥121dB (A-weighted)
Frequency response:
20Hz~20kHz: attenuation＜0.05dB
20Hz~90kHz: attenuation＜3dB
Single-ended line output (RCA output, USB DAC / coaxial decoding / optical decoding)
THD+N:＜0.00053% (1kHz/-10dB@10kΩ)
Crosstalk: ≥118dB (1kHz@10kΩ)
Noise floor:＜2.2μV (A-weighted)
SNR: ≥121dB (A-weighted)
Frequency response:
20Hz~20kHz: attenuation＜0.05dB
20Hz~90kHz: attenuation＜3dB
Line input level: 2.5Vrms (1kHz@10kΩ)
Balanced headphone output (4.4mm output / XLR4, coaxial decoding / optical decoding, ultra-high gain mode)
Output power 1: L+R≥1800mW+1800mW (16Ω, THD+N＜1%)
Output power 2: L+R≥4000mW+4000mW (32Ω, THD+N＜1%)
Output power 3: L+R≥950mW+950mW (300Ω, THD+N＜1%)
Output impedance:＜1.5Ω (32Ω)
THD+N:＜0.00049% (1kHz/-13dB@32Ω)
Crosstalk: ≥76dB (1kHz@32Ω)
Noise floor:＜7.9μV (A-weighted)
SNR: ≥124dB (A-weighted)
Frequency response:
20Hz~20kHz: attenuation＜0.05dB
20Hz~90kHz: attenuation＜3dB
4.4 mm/XLR4 output (coaxial decoding/optical decoding, super-high gain mode)
Output power 1: L+R≥1800mW+1800mW (16Ω, THD+N＜1%)
Output power 2: L+R≥4000mW+4000mW (32Ω, THD+N＜1%)
Output power 3: L+R≥950mW+950mW (300Ω, THD+N＜1%)
Output impedance:＜1.5Ω (32Ω)
THD+N:＜0.00049% (1kHz/-13dB@32Ω)
Crosstalk: ≥76dB (1kHz@32Ω)
Noise floor:＜7.9μV (A-weighted)
SNR: ≥124dB (A-weighted)
Frequency response:
20Hz~20kHz: attenuation＜0.05dB
20Hz~90kHz: attenuation＜3dB
Balanced line output (XLR3, USB DAC / coaxial decode / optical decode)
THD+N:＜0,00045% (1kHz/-10dB@10kΩ)
SNR: ≥125dB (A-weighted)
Crosstalk: ≥121dB (1kHz@10kΩ)
Noise floor:＜2.6μV (A-weighted).
Frequency response:
20Hz~20kHz / attenuation＜0.05dB.
20Hz~90kHz / attenuation＜3dB
Line output level 5Vrms (1kHz@10kΩ)
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