raspberry pi usb audio

You may have heard that raspberry pi build in 3.5mm jack audio playback quality is bad.

I just try it, not that bad.

Anyway, what i would like to try is a usb audio. Actually it is a TECSUN portable mp3/fm player, when plug in usb cable it will behave as a usb audio device.

$aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: U0x19080x1335 [USB Device 0x1908:0x1335], device 0: USB Audio [USB Audio

As i can change audio output from HDMI to 3.5mm jack in raspi-config, i don't know how to switch to usb device. Many answers on the web mention the /etc/modprobe.d/alsa-base.conf, which can't found on jessie release.

Finally i got it right, by edit the ~/.asoundrc

pcm.!default {
	type hw
	card 1
}

ctl.!default {
	type hw
	card 1 
}

Change device 0 to 1, and reboot, it work.

Compare with the 3.5mm jack, not much different. With this little speakers, what can you expected?