Interfacing Linux: Douk Audio U2 USB

Today we’re going to find out if the Douk U2 USB to Toslink optical and coaxial converter knows how to Linux. This was a bit of an adventure since the first unit never reliably powered on and the second was incorrectly assembled.

TL;DW Douk Audio has some serious issues in their QA department, if they have one at all.

Jackbox: Testing setup

CPU AMD Ryzen 7 1700
RAM Corsair LPX 16GB
Motherboard MSI B350 Tomahawk
GPU Nvidia Quadro 4000
SSD Samsung 840
PSU: EVGA 600 B1
Firewire: Syba SY-PEX30016
Network: Intel i350-T4
OS: Debian Buster
Kernel: 5.4.47-rt
Desktop: XFCE 4.12

Alsa setup:

Pulseaudio setup:

Jack setup:

Verdict: I’m unfamiliar with the Douk product line and the Douk U2 has convinced me to keep it that way. Poor build quality and unreliable hardware are not things I look for in audio devices.

Douk U2

3.3 out of 10
Works out of the box
1 out of 10
Ease of setup
1 out of 10
5 out of 10
8 out of 10


Sounds decent, if it works.

Supports 192khz


First unit did not reliably power on.

Second unit was not correctly assembled.

USB micro connector.


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