Douk Audio U2 Pro Mini Converter DSD256 Introduction

This is a USB to Toslink optical/coaxial / 12S(U2 PRO) audio converter, a pure digital sound card, support common losselss playback, suitable for PC computer, notebook, mobile phone, set-top box, rock 64, raspberry pi and so on, it can provide better sound quality than their own sound card.

Front and back panels

douk_audio_u2_pro_mini_converter_dsd256-fig-_(1).png

Parameters

	U2	U2 PRO
Audio input	USB
Audio output	Coaxial/Optical	Coaxial/Optical/ IIS
USB chip	XMOS XU208
Supported sampling rate	PCM: 44.1-192KHz	PCM: 44.1-384KHz
Supported sampling rate	DSD64-DOP	DSD64-128-DOP, native / DSD256, native
Width bit	16-24bit	16-32bit
Working voltage	DC 5V
Working current	130mA

Description

Strong and adaptable, the Douk Audio U2 Pro Mini Converter DSD256 to Coaxial Optical Converter is a headphone amplifier and DAC. It is convenient to carry with you wherever you go due to its compact size and lightweight construction. The robust aluminum alloy shell of the U2 Pro is both fashionable and long-lasting. A volume knob, a power indicator, and two headphone amplifier outputs are included on the front panel. USB, coaxial, and optical connectors are among the digital and analog inputs and outputs included on the rear panel.

How to use

Connect U2/U2 PRO to the USB port of the computer with a USB cable, and the computer USB port can be used for power supply, for U2 pro version you also can use external DC 5V power interface.
After connecting to the computer, the computer will prompt that the USB device has been found, and then please install the driver of this device: XMOS-Stereo-USB-Audio-Class2-Driver-3004_v4.13.0.exe, please choose different versions of drivers according to the computer system.
After installing the driver, the computer will prompt and display the device "XMOS XS1-U8 DJ" in the device manager.

How to play DSD music

Warm tip: 1.3.8 version FOOBAR player is recommended, the player settings of differnt version players will be a little different.

Install the ASIOProxyInstall-0.7.1.2.exe program in the foobar components file, and follow the prompts to complete.
Install the sacd plug-in and ASIO plug-in, as shown below: (The plug-in is in the foobar components file )
Click “Output” on the left side and then select “ASIO:foo_dsd_asio” on the right side as the following picture shows:
Click “Output” --- “ASIO” on the left side, and then double click “foo_dsd_asio” just as the following picture shows：
After double click “foo_dsd_asio”, the following menu will appear and please set as it indicates，(Note: must set as the following picture if want coaxial and optical to output DSD.)
Click the left side “tools” -- “SACD”, and then select “DSD” in ASIO Drive Mode, and then click “Apply” to finish the settings.

Warm tips

Play DSD music need to set the volume of computer/mobile phone to maximum (100), or else there will be no sound output.
For U2 PRO, 12S output supports all sampling rate while S/PDIF supports 192KHz and DOP DSD64 at highest.
For U2 PRO, the pins of 12S is suitable for the HDMI interface of PS decoders.
For U2 PRO, play DSD256 music need to install native driver, please install from the CD driver or download from the website.

Setup Guide

Use these procedures to configure the Douk Audio U2 Pro Mini Converter DSD256:

Use an optical, coaxial, or USB connection to connect the U2 Pro to your computer or other audio source.
Attach your speakers or headphones to the headphone amplifier outputs on the U2 Pro.
Press the power button located on the front panel to turn on the U2 Pro.
Use the front panel's volume knob to change the volume.
In the audio settings of your computer, choose the U2 Pro as your audio output device.

System compatibility

32/64 bit Win 7, Win 8 and Win 10 systems need to install a driver, please enter the website: https://drive.google.com/drive/folders/1ZjWBDD5Te-a8O64fCstuOKIwGRo766wD?usp=sharing to download and install.
Native Mac OS 10.6 and above, can use the system's own driver. And Native Linux with a compliant kernel also can use the system's own driver.(Has tested on Ubuntu and Daphile systems, based on INTEL X86)
In general, USB input default supports Android 5.0 system while Android 4.2 and above need phones with OTG function. Recommend to use Hiby player to play DSD music. OTG cable (for Android system) or camera kit (for IOS system) need to be prepared by yourself.

Troubleshooting

Try the following troubleshooting procedures if the Douk Audio U2 Pro Mini Converter DSD256 is giving you any problems:

Verify the secure connection of every cable.
Verify that the U2 Pro is chosen as the audio output device and that it is turned on.
Verify that the input format of the U2 Pro is compatible with the audio source.
Consider returning the U2 Pro to its original configuration.

Douk Audio U2 Pros & Cons

Pros
- High-quality audio playback
- Versatile input and output options
- Compact and portable design
- Solid build quality
Cons
- No Bluetooth connectivity
- May be too expensive for some users
- Limited customization options

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