1. disable build-in audio (doesn't work, sunxicodec is not kernel module but inside kernel)
```
sudo vim /etc/modprobe.d/alsa-blacklist.conf
blacklist sunxicodec
blacklist sunxi-CODEC (?)
```

2. set usb-dac as primary (doesn't work, usb-dac is dissapear after that)

```
sudo vim /etc/modprobe.d/alsa-base.conf
options snd-usb-audio index=0
options sunxicodec index=1
```

3. set card1 as default

```
sudo vim /etc/asound.conf
pcm.!default {
    type hw
    card 1
}

ctl.!default {
    type hw
    card 1
}
```

4. test

```
speaker-test --format S32_LE --channels 2 -r 44100
```