1
All the pictures below are for illustrations only. Specifics are subject to the ac
tual product.
FIIO K17 complete User manual
2
Content
1.Product Introduction ................................................................................................................. 4
2.Operation Guide......................................................................................................................... 6
3.Detailed Description of Buttons and Interfaces................................................................ 9
(1)Analog Output Interfaces:..............................................................................................9
(2)Knob Functions:.............................................................................................................. 10
(3)Digital Input Interfaces: ................................................................................................ 12
(4)Other Interfaces: ............................................................................................................. 13
4. Main Interface Display...........................................................................................................14
(1)Status Bar (USB Mode as Example): .......................................................................... 14
(2)USB DAC mode interface:............................................................................................ 15
(3)Streaming Mode Interface: .......................................................................................... 15
(4) Local Playback Interface: ............................................................................................. 16
5. Working Modes ....................................................................................................................... 17
(1)USB DAC Mode: .............................................................................................................. 17
(2) Optical Input Mode: ......................................................................................................17
(3)Coaxial Input Mode: .......................................................................................................17
(4)Single-Ended Line Input Mode: ..................................................................................17
(5)Balanced Line Input Mode:..........................................................................................18
(6) Bluetooth Receiver Mode: .......................................................................................... 18
(7)Streaming Mode: ............................................................................................................ 18
(8)Local Playback Mode: ....................................................................................................19
3
6. Menu introduction ..................................................................................................................19
7. Network Connection .............................................................................................................. 26
8. Mobile Remote Control App: FiiO Control Installation and Usage .......................... 28
9. PEQ Function............................................................................................................................ 30
(1)Download and Connection for the Computer Software..................................... 30
(2) Importing, Exporting and Saving EQ Curves ........................................................ 33
(3) Adjusting PEQ with FiiO Control...............................................................................34
10. Streaming Features Introduction ..................................................................................... 35
(1)AirPlay: ............................................................................................................................... 35
(2)Roon Ready:..................................................................................................................... 36
(3)NAS Playback via Roon:................................................................................................ 37
11. Protection Mechanisms .......................................................................................................38
12. Firmware Upgrades introduction ..................................................................................... 40
SOC Upgrade: ....................................................................................................................... 40
MCU Upgrade: ...................................................................................................................... 41
4
1.Product Introduction
(1)Overview:
The K17 is a next-generation flagship-level DAC and headphone amplifier
integrated machine developed by FiiO Electronics in 2024 and launched in January
2025. Its design incorporates retro elements, making it both exquisite and
aesthetically pleasing.
The K17 adds features such as streaming playback and local USB playback,
combining the pure audio system with network bridge functionality, offering
greater versatility compared to previous FiiO desktop products.
The K17 utilizes the powerful independent DSP chip MS21586Q, enabling
professional 31-band PEQ adjustment, paired with PC and mobile apps for rich
customization.
In addition to the DSP chip, the K17 also includes numerous flagship-grade chips:
4191 + dual 4499EX DAC, discrete headphone amplifier circuit, imported ON
Semiconductor JE243G-JE253G transistors, 4-core FPGA, XU316, QCC5125, etc. It
also features a 35W linear power supply, ACCUSILICON low-phase-noise crystal
oscillators, Nichicon audio-grade capacitors, ELNA brown coupling capacitors,
Panasonic film capacitors, wafer resistors, Neutrik connectors, and other high-end
components.
The K17 boasts a rich array of input and output interfaces: dual USB inputs (front
and rear panels), coaxial/optical input, Bluetooth input, streaming, local USB input,
5
balanced input, RCA input, and other digital inputs. It also supports full-featured
coaxial/optical output, RCA line output, XLR balanced line output, as well as
6.35mm/4.4mm/XLR4 headphone outputs. The control system uses dual knobs + a
display for more convenient operation. Like a "versatile warrior," the K17, with its
numerous innovative technologies, will provide users with a brand-new experience.
(2)Supported Sample Rates:
USB DAC Mode: Supports PCM 768K 32-bit, DSD512, and MQA Full Decode.
Coaxial input Mode: Supports PCM 192K 24-bit and DOP64.
Optical input Mode: Supports PCM 96K 24-bit.
Bluetooth Reception Mode: Supports SBC/AAC/aptX/aptX LL/aptX HD/aptX
Adaptive/LDAC.
Streaming Decoding: Supports up to 384kHz/32-bit and DSD256 (DOP).
Local Playback: Supports up to 384kHz/32-bit and DSD256.
Note:
1. The sample rate for USB decoding depends on driver settings and computer
configurations. Please set the sample rate to PCM 768kHz in the computer's audio
settings.
2. Mac computers do not require driver installation. However, specific software like
Audirvana is needed to support DSD playback, with a maximum support of
DSD256.
6
(3)Basic Appearance Information:
Dimensions: Approximately 244.6 x 213 x 66.8 mm.
Colors: Black/Silver.
Weight: Approximately 2750g.
Material: Front panel CNC-machined aluminum alloy, middle frame metal
stamping.
(4)Download Links:
Quick Start Guide: Click Here
USB DAC Driver Download: Click Here
K17 & K19 Dedicated Windows DSP Download: Click Here
K17 & K19 Dedicated macOS DSP: Search for "FiiO DSP" in the App Store.
FiiO Control App: Click Here
K17 Firmware: Click Here
2.Operation Guide
(1)Power On, Power Off, and Standby:
Before powering on, check the voltage selection switch on the bottom of the unit
7
and set it to match the local voltage. Then connect the power cable. Press the
rocker switch on the rear panel to the "-" position, and the power indicator on the
front panel will light up red, indicating that the power is connected. At this point,
the K17 is in the powered-off state. In this state, neither the infrared remote nor the
Trigger In can power on the K17.
Standby, remote control
offers instant power-on
Power off, power supply
connected
Power on
Power On: After the power is connected, turn the front power knob to the ON
position. The indicator will turn white, the display will light up, and the K17 will
power on.
Standby: In the powered-on state, pressing the red standby button on the remote
will put the K17 into standby mode. In standby, the main control and MCU operate
in low-power mode.
Long-Term Non-Use: When not using the product for an extended period, turn off
the rocker switch on the rear panel to cut the main power.
(2)Touchscreen Operation:
8
The K17 features a 3.93-inch touchscreen display.
Power on to enter main Interface. For example, the USB DAC working mode main
interface:
Mode Selection Interface: Swipe left to switch between 8 working modes (USB,
Optical, Bluetooth, Streaming, Coaxial, Line Input, Balanced Input, Local Playback).
Menu Settings Interface: Swipe right to access settings for playback, equalizer,
channel balance, themes, backlight, etc.
VU Meter Interface: Available in streaming or local playback modes; other modes
9
do not currently support VU meters (DSD is also unsupported).
3.Detailed Description of Buttons and
Interfaces
(1)Analog Output Interfaces:
a.Headphone Output ports:
6.35mm single-ended output: Outputs left and right positive signals (R+, L+),
directly parallel to the balanced output. Simultaneous connection of single-ended
and balanced headphones may increase load; avoid excessive volume + gain to
prevent abnormal operation.
4.4mm balanced output: Outputs left/right positive and negative signals (R+, R-,
L+, L-).
XLR4 balanced output: Outputs left/right positive and negative signals (R+, R-, L+,
L-), internally parallel to the 4.4mm balanced output.
Warning: Incorrect adapters (e.g., balanced-to-single-ended cables that short L
- and R- to ground) may trigger overload protection.
10
b.Line Output ports:
RCA single-ended output: Stereo line output (R+, L+ and ground). Maximum
output is 2.5Vrms; reduce volume in PRE mode if distortion occurs.
XLR3 balanced output: Balanced line output (R+, R-, L+, L-), suitable for active
speakers or amplifiers.
(2)Knob Functions:
a.Power on/off Selector Switch: Controls power on/off. Remote wake-up is d
isabled when the knob is in the off position.
b.Analog Output Selector Switch: Switch output PO+PRE, PO, PRE and LO
PO+PRE: Simultaneous headphone and line output, with volume and gain
adjustments affecting both.
PO: Only headphone outputs are active (6.35mm, 4.4mm, XLR4).
PRE: Only line outputs are active (RCA, XLR3), with adjustable volume (unaffected
by gain).
LO: Fixed maximum volume line output (volume and gain controls disabled). Ensure
connected devices are set to appropriate levels to avoid loud noises.
c.Gain Switch: Five levels—L (Low), M (Medium), H (High), SH (Super High),
UH (Ultra High). Gain can be achieved through software gain, which controls
the internal volume output level via software, or hardware gain, which change
s the amplification factor of the hardware circuit.
11
Gain
Hardware gain
Software gain
Whole gain
LOW
L=0dB
-12dB
-12dB
Medium
L=0dB
-6dB
-6dB
High
L=0dB
-3dB
-3dB
Super High
H=+12dB
-3dB
+9dB
Ultra High
H=+12dB
0dB
+12dB
As shown in the table above, the Ultra high mode and Super High gain mode are
hardware high gain modes. The L/M/H modes are hardware low gain modes.
d.INPUT/MENU Knob: When rotating, the display screen pops up an input
selection menu. If no action is taken for 3 seconds after stopping at a specific input,
the device automatically enters this operating mode. When rotating and stopping
at a specific input mode, pressing the button immediately enters this operating
mode.
e.VOLUME Knob: Rotate to adjust the volume up or down. At this point, the display
screen will pop up the volume adjustment interface, as shown in the figure. A short
press on the knob will turn the screen off or on. (Note: In the Settings menu under
Other Settings, the “Short press volume knob” setting can modify the response
12
function of a short press on the knob, which can be selected as “Turn off/wake up”
or “Mute/unmute” functionality.)
(3)Digital Input Interfaces:
a.USB IN (Front/Rear): For connecting computers, phones, or players. The front
USB takes priority if both are connected.
Note:
1. Windows 10+ requires driver installation(Win7 or below is not supported.);
macOS does not.
2.PS4/PS5 requires UAC1.0 mode (set in the K17 menu).
b.RS232: For PEQ adjustment or firmware upgrades via PC.
c.COAXIAL IN: Coaxial input
d.OPTICAL IN: Optical input
13
e.USB HOST: Connect a USB flash drive for local playback. This interface has a
current limit of 500mA. If you need to connect an external hard drive, please use an
external power supply.
The USB flash drive capacity has been tested to support up to 256GB. Supported
formats include FAT32, NTFS, and exFat.
f. LAN: Ethernet port (10/100/1000Mbps).
(4)Other Interfaces:
a.Grounding Switch: Toggles chassis-ground connection to reduce hum in
multi-device setups.
1.When K17 is paired with other device which cannot be connected to the power
ground, it can be connected through the grounding post.
2.You can connect the metal shell of K17 directly to the earth through the
grounding post, which can enhance the anti-static capability of the equipment.
3.Improve the ground loop, potentially to improve loop interference
b.TRIGGER IN: 12V trigger input for synchronized power on/off with other devices.
Trigger IN: Nominal 12V trigger, which can be triggered via 5-15V. The power
consumption is lower than 20mA;
It is recommended to use a 2pins 3.5mm cables or a 3pins 3.5mm cables (in
practice, the L and GND pins are used for the positive/negative signals, and the R
pin is not connected.)
14
c.RF Antennas: Right (near power input) for Bluetooth; left (near coaxial port) for
Wi-Fi (2.4G/5G dual-band). Avoid blocking antennas.
4. Main Interface Display
(1)Status Bar (USB Mode as Example):
1.Current mode (e.g., USB DAC mode).
2.Sample rate (e.g., DSD512).
3.Current EQ type
4.Network status
WiFi connected
WiFi disconnected
Ethernet
connected
Ethernet
disconnected
5.Output mode (PO+PRE/PO/PRE/LO).
6.Gain level (L/M/H/SH/UH).
7.Volume level (0–120).
15
(2)USB DAC mode interface:
9. Current working mode: USB DAC decoding mode
10. Current playback track format
11. Current EQ type
12. Current playback track sampling rate
(3)Streaming Mode Interface:
1.Streaming Connection Mode: Distinguish between Airplay and Roon Ready.
2.Song Title and Artist Information: Primarily displays the song title and artist name.
However, some music playback software may display lyrics or other content after
the song title, which may cause the display to refresh depending on the software.
3.Playback Order: Can switch between sequential playback, loop playback,
single-track playback, and single-track loop. Only effective in Roon Ready mode;
Airplay does not support this feature due to protocol limitations.
4.Shuffle Play: Enable or disable shuffle mode. Only effective in Roon Ready mode;
Airplay does not support this feature due to protocol limitations.
5.Song Duration and Progress Bar
6.Previous Track
16
7.Play/Pause
8.Next Track
(4) Local Playback Interface:
1. Song Title
2. Song Duration and Progress Bar
3. Playback Mode: Can switch between sequential playback, loop playback, shuffle
play, single-track playback, and single-track loop.
4. Add or Remove from Favorites
5. Jump to Current Playlist
6. Previous Track
7. Play/Pause
8. Next Track
9. Cover Display: Note that the current firmware only supports JPG format covers
embedded in the track file, with a size not exceeding 1.2MB. Folder covers and
BMP/PNG format covers are not currently supported.
17
5. Working Modes
(1)USB DAC Mode:
PCM: 44.1kHz–768kHz, 16–32-bit.
DSD: DSD64–DSD512.
MQA: 8x full decode.
Multichannel WAV or other formats: Unsupported.
Mono tracks: Only ≥44.1kHz supported. For playback of tracks below 44.1kHz, use
software SRC to upsample the track to 44.1kHz or 48kHz before playback.
(2)Optical Input Mode:
PCM: 44.1kHz–96kHz;
DSD not supported
(3)Coaxial Input Mode:
PCM: 44.1kHz– 192kHz;
DSD: DSD64.
(4)Single-Ended Line Input Mode:
Single-Ended Line input mode supports single-ended headphone output and
balanced headphone output (front output switch set to PO+PRE or PO), as well as
rear panel line output (front output switch must be set to PRE or LO).
18
(5)Balanced Line Input Mode:
Balanced line input mode supports single-ended headphone output and balan
ced headphone output (front output switch set to PO+PRE or PO), as well as
rear panel line output (front output switch must be set to PRE or LO).
(6)Bluetooth Receiver Mode:
K17 uses the QCC5125 Bluetooth receiver chip, Bluetooth version 5.1, and supports
AAC/SBC/aptX/aptX-LL/aptX-HD/aptX-Adaptive/LDAC encoding formats.
(7)Streaming Mode:
Preliminary Note: K17 supports Airplay and Roon Ready streaming methods. Both
require connecting the K17 and the streaming device (e.g., phone or computer) to
the same local network.
Airplay: After connecting to an Apple device, you can stream via Airplay in Apple
Music or QQ Music.
Roon Ready: Connect the K17 and the device to the same network, then enable the
FIIO K17 in ROON CORE Settings > Audio. Supports 44.1kHz–384kHz; 16bit–32bit,
DSD64-DSD256 (DOP).
Note: K17 does not support DLNA (UPnP).
How to confirm if the device is on the same local network?
Check the IP address in the K17 Settings menu > Device Info and compare it with
the phone’s IP address. If the first three segments are the same, they are on the
19
same local network. For example, if the K17 IP is 192.168.123.2 and the phone IP is
192.168.123.3, both devices belong to the 192.168.123.xxx network segment,
confirming they are on the same local network.
(8)Local Playback Mode:
The bottom row of the input mode selection interface is only active in local
playback mode. In other modes, it is grayed out and inactive.
K17 can scan and play songs from a USB drive.
Supports decoding and playback of AAC/AIF/AIFF/APE/FLAC/MP3/WAV/DSD
formats, with maximum sampling rates of PCM384K and DSD256.
Does not support: OGG format, CUE track splitting.
Cover support: Only supports JPG format embedded covers under 1.2MB. Other
formats and external covers are not supported.
6. Menu introduction
Playback Settings:
1.Playback Mode:
20
Sequential Playback: Plays tracks in order and stops after the list ends.
Loop Playback: Plays tracks in order and restarts the list after completion.
Shuffle Playback: Randomly skips tracks within the current playlist.
Single-Track Playback: Plays only the current track and stops after completion.
Single-Track Loop: Repeats the current track indefinitely.
2.Resume Playback:
Off: Does not auto-play tracks after restarting; requires manual playback.
Position: In USB playback mode, resumes playback from the last position after
restarting.
Song: In USB playback mode, restarts playback from the beginning of the last track
after restarting.
Equalizer:
Includes 7 preset EQ curves (unmodifiable) and 10 customizable EQ slots for user
adjustments.
Filter: 6 digital filters.
Max Volume: Limits the maximum output volume to prevent accidental loud
playback.
Balance: Adjusts left/right channel volume compensation to correct imbalances.
Network: Switch between wired and wireless connections.
Brightness: Adjusts screen brightness.
21
Screen Time: Sets the screen auto-off timer.
RGB light: When set to "Color Follows Audio," the sampling rate follows the table
below.
Bluetooth Format Indicator Colors
SBC: Blue
AAC: Cyan
aptX/aptX LL: Purple
aptX-HD: Yellow
aptX Adaptive: Green
LDAC: White
Connected without detecting the codec:
Blue
Pairing: Red and blue flash alternately
Digital Input Audio Quality Indicators
Cyan: Sampling rate ≤48 kHz.
Yellow: Sampling rate >48 kHz.
Green: DSD format.
Magenta: MQA format (only supported
via USB input with EQ turned OFF).
Line in
Cyan
22
Theme: Currently, K17 offers two themes. Selecting a theme will trigger an
automatic restart to apply the change.
Trigger In: Enable or disable Trigger In functionality.
Idle time: If no data is input within the set time, K17 enters power-saving mode,
shutting down some analog circuits (digital circuits remain active). The knob light
will turn off. Playback resumes automatically when data is detected.
Note: Smart idle is unavailable in RCA and balanced line input modes.
U Audio: Supports UAC1.0 and UAC2.0.
UAC1.0: No driver required. Compatible with SWITCH, PS5, PS4, etc. Supports 44k–
96k.
UAC2.0: Typically used for players, phones, and PCs. On Windows, download the
FiiO driver from:
https://forum.fiio.com/note/showNoteContent.do?id=202105191527366657910&t
id=17 . Supports PCM44K–768K, DSD64–DSD512, MQA. macOS does not require
drivers.
Language: Supports Chinese, English, and Japanese.
Others: Includes Press the volume knob, FW update, reset options, and factory
debugging.
1.Press the volume knob: Set to toggle screen on/off or mute/unmute.
23
2. FW Update: Includes SOC online update, SOC local update, and MCU update.
The K17 employs a dual-master architecture:
SOC handles local playback, streaming, VU meter calculations, UI display, and
operations.MCU manages power control, mute functions, DAC control, PEQ
adjustments, etc.
Thus, separate firmware upgrades are required for the SOC and MCU.
(1)SOC Online Upgrade:
When the K17 is connected to the internet, this setting allows online updates to the
latest SOC firmware. If the SOC already has the latest version, a prompt will indicate
no update is needed.
Note: Only firmware versions V174 or higher support online upgrades. For versions
below V174, users must first download the V174 (or later) firmware via USB for a
local upgrade before enabling online updates.
(2)SOC Local Upgrade:
Insert a USB drive (formatted as FAT32) containing the unzipped SOC firmware
(a .zip file downloaded from FiiO’s website) into the K17’s rear USB-A port.
Navigate to Settings > Firmware Upgrade > SOC Upgrade to initiate the update.
Key Notes:
1.Do not rename or extract the .zip file.
2.Place the file directly in the USB root directory (no subfolders).
24
3.macOS users must disable Safari’s auto-unzip feature: Safari > Preferences >
General > Uncheck "Open safe files after downloading".
(3)MCU Upgrade:
Download the MCU firmware (a .bin file) to a computer.Connect the K17’s RS232
port to the computer via USB. Navigate to Settings > Other Settings > Firmware
Upgrade > MCU Upgrade. A virtual USB drive will appear on the computer.
Copy the .bin file into this drive, then eject the drive via "My Computer" (not the
system tray icon). The K17 will auto-reboot after upgrading.
25
Note:
1.When ejecting the USB drive, be sure to select "Eject" in "My Computer" instead
of using the disk ejection option in the lower right corner of the computer.
Otherwise, the K17 will not detect the ejection action and will not enter the
upgrade state.
2.If the K17 fails to reboot within 3 minutes, replug the USB cable and retry ejection.
3.If "Upgrade Timeout" appears, restart the process from the menu.
3.Reset Options:
The K17 allows partial resets for network settings, EQ, Bluetooth, song library, etc.,
or a full "Restore Factory Settings" to revert to the original state.
4.Factory Debug:
For troubleshooting, insert a USB drive into the K17’s USB-A port and select
Factory Debugging. The system will save diagnostic logs (non-user data) into a
fiio_log folder on the drive. Share this folder with FiiO support for analysis.
About K17:
Displays firmware versions for MCU, SOC, FPGA, and the number of songs scanned
from a USB drive. When connected to a network, it also shows the K17’s IP address
to verify LAN connectivity with other devices.
26
7. Network Connection
The K17 supports both WiFi (2.4G/5G dual-band) and wired network connections.
In the "Network Settings" menu, first select the network you wish to connect to.
Wired Network:
After plugging the network cable into the Ethernet port on the back of the K17,
select "Wired Network" in the menu. The K17 will automatically connect to the
network. The wired network supports three speeds: 10M/100M/1000Mbps. Once
connected, the network icon in the status bar on the K17's main interface will
display as connected. Additionally, the network IP can be viewed in the "Device
Information" menu.
Ethernet
connected
Ethernet
disconnected
Wireless Network:
In the "Network Settings" menu, click on "Wireless Network." The K17 will search
for available WiFi networks and display a list once the scan is complete. Click on the
desired WiFi network to enter the password input screen. After entering the correct
password, confirm by selecting the √ icon, and the K17 will automatically connect
to the WiFi hotspot.
27
Once the wireless network is successfully connected, the WiFi icon in the status bar
on the main interface will change to "connected," and the network IP can be viewed
in the "Device Information" menu.
Notes:
1.The K17's character keyboard is simplified and does not support certain special
characters. If your password contains special characters, please modify the
password before connecting.
2.The WiFi password field on the K17 displays a maximum of 17 characters. If the
password exceeds this length, drag the gray scroll bar at the bottom to view the
remaining characters.
3.The K17 can only determine whether it is connected to a wired or wireless
network, not whether the network has internet access.
4.For router WiFi encryption settings, please select WPA2-PSK. If WPA3-PSK is
selected, the WiFi connection will fail. If you are unable to connect after entering
the correct password, check the router settings to ensure it is configured as
specified.
28
8. Mobile Remote Control App: FiiO
Control Installation and Usage
After installing FiiO Control on your smartphone, you can remotely control the
K17's local playback, PEQ adjustments, and other functions. The steps are as
follows:
(1)Search for the "FiiO Control" app in your app store, download the latest version,
and install it.
(2)Ensure both the K17 and your smartphone are connected to the same network.
(How to confirm they are on the same network:
Check the IP address in the K17's "Device Information" menu (under Settings).
Compare it with your phone's IP address. If the first three segments match, they are
on the same local network.
Example:
K17 IP: 192.168.123.2
Phone IP: 192.168.123.3
Both devices belong to the 192.168.123.xxx subnet, confirming they are on the
same network.)
(3)Open the FiiO Control app (if prompted for permissions upon first launch, grant
the necessary permissions). Follow these steps to connect to the K17:
29
Notes:
3.1: If there are two or more K17 devices, check the IP address in the K17's "Device
Information" menu and select the correct one in the app.
3.2: If no devices appear, click the refresh icon at the top right.
3.3: If the device still does not appear after refreshing, manually enter the K17's IP
address by clicking "Manually Enter Linker Control IP" at the top of the app
interface.
3.4: To control USB playback, ensure the K17 is switched to "Local Playback" mode
first.
After opening the
app, click "Add New
Device" in the
center.
Click the "Player"
icon at the bottom
right.
Click the refresh
icon at the top right.
Once the K17 is
detected, click to
connect.
Connection
successful.
30
(4)After connecting, you will enter the app's main control interface, where you can
adjust local playback, EQ settings, volume, and more.
9. PEQ Function
The K17 features a built-in dedicated DSP chip, the M21586Q, which supports
64-bit double-precision floating-point operations and operates at a 360MHz clock
speed, enabling the K17 to offer professional-grade 31-band PEQ adjustments. In
the "Equalizer" menu, seven commonly used presets are available: Jazz, Rock, R&B,
Hip-Hop, Pop, Dance, and Classical. Additionally, it supports 10 customizable PEQ
curves.
There are two ways to adjust custom curves: via computer software or a mobile
app.
(1)Download and Connection for the Computer
Software
Windows version DSP for K17 & K19: Click here
Mac OS version DSP for K17 & K19: Search for "FiiO DSP" on the App Store to
download.
31
After downloading and installing, connect the K17's rear RS232 interface to the
computer using a USB cable. The PEQ software will automatically connect once
launched. If the connection fails, click the "Connect" button in the upper right
corner to retry. Upon successful connection, the red "Connect" text will turn green
and display "Disconnect."
As shown in the figure below, you can select the PEQ settings. When "Custo
m" is selected, you can adjust the curve interface at the bottom to set your
preferred curve. After setting the curve, you need to click "Save EQ" and cho
ose a save location to store the curve on the K17 device.
32
The preset curves cannot be modified. If you alter a preset curve and click "S
ave," you must save it under any custom slot instead of overwriting the origi
nal preset EQ.
After saving, the K17 can disconnect from the computer, and you can directly
select the adjusted curve from the K17 menu. The names of custom curves
can be modified via the mobile app. (Note: The computer software is hardco
ded and cannot display or modify custom curve names.)
33
(2) Importing, Exporting and Saving EQ Curves
When you click "EQ Export" the current EQ settings can be saved to your co
mputer as a local parameter file with an .XML extension. Clicking "Import EQ"
allows you to load an EQ parameter file into the DSP client, and the K19/K1
7 will immediately apply the settings. Exporting files makes it easy to share w
ith others. FiiO also provides tuning curves for some headphones—contact cu
stomer service for details.
34
When the DSP client is connected, any imported or modified EQ settings will
take effect immediately on the K19/K17. However, the changes will not be st
ored permanently. To save the parameters to the K19/K17, click the "Save EQ
" button and store them in Custom 1–Custom 10, overwriting the previous cu
stom settings.
For a detailed DSP tutorial, please refer to the FAQ on the right: https://www.
fiio.com/newsinfo/926001.html
Note: The DSP adjustments for the K17 and K19 can only be made using the
above DSP software and cannot be controlled via the web-based PEQ interfa
ce at https://fiiocontrol.fiio.com/.
(2) Adjusting PEQ with FiiO Control
Please download and install the "FiiO Control" app from your mobile app sto
re.
35
After entering the "Equalizer" option, you can adjust the curve directly on yo
ur phone. Once the adjustments are complete, click "Save" to synchronize an
d store the settings to the K17.
10. Streaming Features Introduction
Preface: The K17 supports two streaming methods, AirPlay and Roon Ready. Both
require the K17 and the casting device (e.g., a phone or computer) to be connected
to the same network for casting.
(1)AirPlay:
The K17 supports AirPlay 1st generation. After connecting to an Apple device, you
can remotely cast music from Apple Music or other APPs via AirPlay.
36
Note: The K17 runs on the AirPlay 1 protocol. After updating to iOS 18.4, the album
cover may freeze on the first song's artwork and not refresh when switching tracks.
This is an iOS issue, and we hope it will be resolved in future updates.
(2)Roon Ready:
You need to install the Roon music software on your phone or computer. Then, in
the settings under "Audio," select the Roon Ready device as "FiiO K17." Once
connected, you can cast music to the K17 for playback.
37
(3)NAS Playback via Roon:
3.1. First, ensure the NAS, phone (or computer), and K17 are on the same local
network.
3.2. Install Roon Server on the NAS and the Roon music player on your phone (or
computer). In Roon's settings, select the NAS server as shown below.
[Image]
3.3. Add songs from the NAS to Roon.
3.4. Set the K17 to streaming mode and connect to your phone via Roon Ready to
access songs on the NAS.
38
11. Protection Mechanisms
(1)Overload Protection: When the headphone output interface exceeds a certain
power level, overload protection will be triggered. At this time, the K17 display will
pop up a warning message: "Overload anomaly, please power off and restart."
Please check whether the headphone wiring is abnormal or if the headphone
interface is fully inserted. After confirming everything is correct, power off and
restart the K17, then try playing again. Short circuits between channels can also
trigger overload protection. Therefore, in certain special situations, such as
repeatedly and quickly plugging and unplugging headphones, there is a small
probability of triggering overload protection.
39
(2)DC Protection: When the internal circuit is damaged, direct current (DC) may be
generated in the circuit, which could damage the headphones. The DC protection
function effectively safeguards against such abnormal conditions. If a DC
protection pop-up appears, try turning off the AC power supply and then turning it
back on to restart the K17. If the issue persists, please contact customer service for
factory repair.
(3)Temperature Protection: The K17 has a built-in temperature detection circuit.
When the device overheats and reaches the protection temperature, an
over-temperature protection alert will appear. In this case, please power off the K17
and let it rest for a while. Once the temperature has slightly decreased, you can use
it again.
(4)AC Fuse: The K17 has a built-in fuse above the AC power socket, as shown in the
diagram. If the device shows no response when plugged in and powered on, check
whether the fuse has blown. If so, you can replace the fuse yourself. The fuse
specification is 250V 0.5A.
40
12. Firmware Upgrades introduction
K17 supports firmware upgrades for SOC, MCU, Bluetooth chip, and XMOS316.
SOC Upgrade:
1.OTA Upgrade:
After connecting K17 to the internet or switching networks, a pop-up notification
for new firmware will appear. You can choose to cancel, remind later, or proceed
with the upgrade. Alternatively, navigate to Menu > Other Settings > Firmware
Upgrade > Main Controller Online Upgrade to initiate OTA.
If the OTA upgrade is interrupted due to network or power failure, K17 may get
stuck on a black "Updating" screen. Restarting the device will not resolve this.
Reconnect K17 to the same network used during the OTA to resume the upgrade
(resume from breakpoint).
After completion, K17 will automatically reboot.
If the upgrade remains stuck on "Updating" despite restarting or reconnecting, use
USB drive recovery:
Download the latest K17 firmware from the official link:
41
https://forum.fiio.com/note/showNoteContent.do?id=202502271503045491606
Insert the USB drive into the rear USB-A port of K17.
Copy the compressed file”K17_update_20250317_Vxxx” to a USB drive, manually
extract it, and rename the extracted folder to "K17_update_images".
With K17 powered off, hold the volume knob, then turn on the AC power switch.
K17 will boot into a black "Updating" screen—release the knob. Wait ~10 minutes
for completion.
If issues persist, please contact FiiO support.
2.USB Drive Upgrade:
Tutorial video: https://youtu.be/anhViDWo4Ws
Download the latest firmware and guide from Fiio ’ s website, then follow the
instructions to copy files to the USB drive. Navigate to Menu > Other Settings >
Firmware Upgrade > Main Controller Local Upgrade.
Note: Some USB drives may have compatibility issues. Try another drive or contact
support if the upgrade fails.
MCU Upgrade:
Tutorial video: https://youtu.be/WN-fyWZ53fQ
42
Notes:
1.Windows: After copying firmware, right-click the USB drive in "This PC" and select
"Eject". Using the system tray’s "Safely Remove" option will cause MCU upgrade
failure.
2.Mac: macOS may auto-generate duplicate files (e.g., .DS_Store), causing upgrade
failures. This issue is fixed in MCU firmware V84+. For older versions, manually
reveal hidden files before ejecting
