Your operating system, music player, and sound card all work together to process the audio on your computer. While these settings are helpful, the processing of your audio by these devices often leads to distortion and a degradation in quality. Setting up bit perfect audio playback ensures that your audio goes directly to your preferred digital to analog converter (DAC) without alterations; giving you the best possible sound reproduction from your system.
I recently picked up a
Schiit Stack for
my desktop. Being impulsive, I bought it before I
really knew how to setup bit perfect audio in Linux. After a lot of
research and a bit of frustration, I found a few viable methods for
setting bit perfect audio in Ubuntu.
Ubuntu and many distributions use
PulseAudio to pass audio from applications and your hardware. As a burgeoning audiophile I don't really like that it
re-samples the audio it processes. If you would like to get bit perfect audio with Pulse, I found an
excellent guide that walks your through the steps. But I don't feel that that method is suitable for what I wanted to do on my system and requires more CPU and RAM usage. I wanted a simple and elegant solution for sending my audio stream directly to my DAC and let the Modi process my audio.
In order to do this I used
Advanced Linux Sound Architecture (ALSA) and
Gmusicbrowser. The setup and configuration is incredibly easy and only involves a couple of terminal commands (
highlighted in blue).
I'm using Xubuntu 14.04 but this guide will work in any Ubuntu/Debian derivative and many modern GNU/Linux distributions.
For non Ubuntu users you need to make sure the necessary ALSA tools are installed (change the sudo apt-get command with whatever is appropriate for your distribution)
sudo apt-get install alsa alsa-utils
Install gmusicbrowser:
sudo apt-get install gmusicbrowser
Install the correct codecs for mp3, flac, ogg
sudo apt-get install gstreamer0.10-plugins-ugly flac libvorbis0a
This guide installs all the necessary dependencies for stock gmusicbrowser installs and audio playback.
Consult the gmusicbroswer site for additional plugin dependencies
List Your audio devices/sound card
a play -l
As you can see my Schiit Modi DAC is listed as card: 1
Alternatively you can use
alsa-mixer to find your audio device, once you enter the command press F6 to list your sound card
Now start gmusicbrowser and navigate to Settings>Audio:
Change
output device to: alsa
Then click on
advanced options
Enter the correct sound card for your device, use the formula
hw:X,0 replacing the
X with your prefered sound card. For my DAC I entered hw:1,0
I really enjoy this setup, my audio plays from gmusicbrower without being touched and everything else plays through my speakers.
You can use other music players in Linux to achieve bit perfect playback in Linux, I also like
DeaDBeef. Head-Fi user Rizlaw did an
excellent write up other music players and his guides inspired this post.
Additionally you can also set VLC to use ALSA to send your audio directly to your DAC. You can find the Audio configuration setting under under Tools>Preferences.
Set
Output module to
ALSA audio output
And
Devices to
The Name of Your DAC, USB Audio Direct Hardware
