Fosi Audio DAC K3 User manual

Fosi Audio DAC K3 User’s Guide
D256

DAC K3 is a compact audio decoder. It is an all-in-one device
with Type-C, USB input, supporting both RCA, AUX analog
outputs and optical, coaxial dual digital outputs. Adopt the
XMOS XU208 USB decoder chip, supports 24Bit/384kHz
sampling rate and DSD256 hardware decoding to achieve
high fidelity quality sound, brings you live-like sound quality.
Fosi Audio DAC K3 User’s Guide
001
Product specifications:
Input interface:
Type-C, USB
Output interfaces:
RCA, AUX, Optical, Coaxial
Volume adjustment mode: High precision volume knob
USB decode chipset:
XMOS XU208
D/A conversion chip:
ES9038Q2M
Op amp:
OPA1602 (replaceable)
USB input:
24Bit/384kHz
Optical, coaxial output:
24Bit/192kHz + DSD64 DOP
DSD hardware decoding:
DSD256
Frequency response:
16-20k Hz
S/N ratio:
129dB
Headphone output impedance:
16ohm-300ohm
Headphone amplifier thrust:
16ohm/275mW 64ohm/69mW
Headphone mode:
op amp + transistor
Product size:
105x112x34mm 4.12x4.41x1.34in (including knob, etc.)
Product weight:
265g

D256
002
Product overview & control functions:
Package contents:
3.5mm
Headphone Output
OLED
Display
Volume Control
& Power Switch
Type-C
Input
USB
Input
OPT
Output
COA
Output
RCA
Output
Fosi Audio K3 ×1 User manual ×1PC-USB cable ×1
Note: 1. K3 Type-C and USB inputs are directly connect
to the audio source, they can't be connected to
power adapter.
2. The Type C and the USB input can't be used at
the same time;
3. The Type-C support OTG input, but can't
support some OTG devices because they can't
provide enough electricity to power K3. (When
the cable connected, the K3 can't power on)

003
Quick setup
Plug-and-Play Mode
Foobar2000 DSD Playback Mode
How to use?
How to playing DSD file?
Step 1: Connect the computer to the K3 and power up.
Step 2: Click the sound icon , select playback device:
"Trasam HiFi USB Audio", and then please enjoy
yourself!
Also, right-click the sound icon , Open Volume Mixer,
click on the icon of the device – “Trasam HiFi USB Audio”
to open the properties, click the Advanced, select 24Bit,
384000Hz for maximum sound quality output.
Preparation:
Download the Fosi Audio K3 DSD Configuration Kit
(Windows 10 for example)
(Windows 10 for example)
drive.google.com/file/d/14BYh_Mbhaa2uWm3krDqjR
ouhAnWbCHzd/view
Step 1: Install the USB Audio Driver (Default path installation)
Step 2: Install ASIOProxyInstall-0.9.4 (Default path installation)
Step 3: Install Foobar2000 1.61 (Default path installation)
Tip: You can log in to Google Cloud Drive to view video of the
installation and configuration.
https://

004
How to playing DSD file?
Scan the QR code and download
the Fosi Audio K3 DSD Configuration
Kit and Installation Video.
Step 5: Configuring Foobar2000
Open Foobar2000, click on File→Preferences→Tools
→SCAD, and select Output Mode as DSD
Click Playback→Output→ASIO, double-click ASIO drivers:
"foo_dsd_asio", select "Trasam USB Audio Device" and
close the window
Click Playback→Output, select the output device: "ASIO:
foo_dsd_asio" and then Apply
Add a music and then enjoy the sound.
Step 4: Copy the Foobar2000 DSD Playback plugin:
"ASIOhost32.exe", "ASIOhost64.exe",
"foo_input_sacd.dll", "foo_out_asio.dll"
Open the Foobar2000 file path:
C:\Program Files (x86)\foobar2000\components
Paste the plugin into this directory

005
Q&A
1. I can't play Spotify music in Plug and Play mode?
Please exit the Spotify app and switch the playback device to
the computer's own sound card device, open Spotify and play,
confirm that it works and then switch the playback device to
DAC K3 "Trasam HiFi USB Audio".
2. I can' t play DSD files on the Foobar2000 app?
Please completely uninstall Foobar2000 including the plugins
and follow the steps in the video exactly to install the program
and configure it.
If this does not solve the problem, please contact the
after-sales email.
3. Get noise when playing music?
- Please replace to the other USB port of your computer and
check again. Recommended connection of USB 3.0 port.
- Please keep this device away from other electronic
devices.
- Try using different playback software and song detection.
4. The device turns on but the computer does not recognize it?
- Make sure to use the USB cable supplied with the product.
- Make sure that the Type C and USB ports are not connected at
the same time.
-OTG cable only supports one-way data transmission, try the
other end for input.
- Please update your computer system to the latest version and
reboot your device and computer.
5. K3 can't power on when connect the OTG cable to my
phone?

006
Warranty Information
About Fosi Audio
All Fosi Audio products have an 18-month limited warranty on
parts and labor from the date of purchase. Please contact us if
you have any problems.
Fosi Audio designs and builds innovative audio products with
all your music in mind. Great sound, simple but elegant
designs, high-quality materials, and truly useful features are
what Fosi Audio is about. We sincerely hope you get as much
enjoyment from our products as we’ve had to create them!
Our website: www.fosiaudio.com
Amazon store: www.amazon.com/fosiaudio
Our Youtube channel: Fosi Audio
Our Facebook page: Fosi Audio
WhatsApp: [phone]
After-sale Service and Technical Support Email:
[e-mail]
[e-mail]
- Please make sure that your phone is fully charged.
- Some OTG devices can't provide enough electricity to
power K3, so please change other devices to have a try.
- Please make sure that the Type C and the USB port on the
back of K3 can't be connected at same time.
- You can't connect the Type C port to the power adapter/
supply, it's designed for connecting the audio source.
Note: If you encounter any problems during use, please
contact the after-sales email.