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DIY amp and Linux Ubuntu 8.10

post #1 of 15
2/3/09 at 1:06pm
Thread Starter 
DIY usb DAC + amp using DAC chip TI PCM2706

movie player / vlc : very good
amarok: only hear the sound from my laptop's speaker, it can't transfer sound to the usb DAC even though I choose all all option in Setting -> Engine.

Anybody help me ?

p/s : I also want to ask about DAC chip, I have a plan to setup the usb soundcard for audiophile, but I don't know what DAC chip work well and have good sound with Linux. Im now only now 4 of them: TI PCM2702; TI PCM2704; TI PCM2706; TI PCM2707; TI PCM2902.
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post #2 of 15
2/3/09 at 1:24pm
id really recommend checking up on a Linux forum for the answer to your question. configuration at that level is really beyond the scope of most Head-Fi'ers
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post #3 of 15
2/3/09 at 1:27pm
System, Preferences, Sound.

Change "Movies and Music sound playback" to the USB DAC.

My D3 comes up as Burr-Brown from TI.

Steven.
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post #4 of 15
2/3/09 at 1:42pm
Make sure that USB audio is selected for all your playback devices in System Sound preferences. I'm using a PCM2702 based external usb DAC on Ubuntu 8.04 and it works great.

You might also want to try a different music player, like Banshee, to see if it works any better. When I first set my DAC up, the sound was crap, and I was relieved when the problem went away when I tried a different music player.

I suspect all the chips in the 2700 family will all use the same Linux drivers, not sure about the 2902. Your best bet would be to compare the audio specifications, if there are differences between them.
Having a look here: http://focus.ti.com/docs/prod/folder...t/pcm2706.html shows that the 2702 has a 7db better signal to noise ratio, in theory making it a quieter chip. The other models have more features, but they may not sound as good..

The 2902 is not as good as any of the 2700 line.. http://focus.ti.com/docs/prod/folder...t/pcm2902.html
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post #5 of 15
2/5/09 at 7:28am
Thread Starter 
hi Swayne,
System, Preferences, Sound. >> I did it

And as I say above, VLC and MPlayer very good with this usb DAC. But only Amarok keep it silent !
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post #6 of 15
2/5/09 at 8:14am
Quote:
Originally Posted by phulerock View Post
hi Swayne,
System, Preferences, Sound. >> I did it

And as I say above, VLC and MPlayer very good with this usb DAC. But only Amarok keep it silent !
I prefer Banshee at the moment. No doubt I'll prefer something else before too long.

Steven.
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post #7 of 15
2/8/09 at 6:47am
Thread Starter 
ok, I will try Banshee now, I can't wait anyone solution for Amarok.

So anyone know how to know the usbsound card belong which device. Example: /media/cdrom belong /dev/cdrom

I want to try start Amarok in the command line with output device parameter

My last try.
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post #8 of 15
2/8/09 at 6:52am
Quote:
Originally Posted by phulerock View Post
ok, I will try Banshee now, I can't wait anyone solution for Amarok.

So anyone know how to know the usbsound card belong which device. Example: /media/cdrom belong /dev/cdrom

I want to try start Amarok in the command line with output device parameter

My last try.
That's confusing. /media/cdrom and /dev/cdrom are the CD drive, not an output device.

What does the command:

asoundconf list

give you?

( If it doesn't work then you need to install alsa-utils first )

Steven.
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post #9 of 15
2/8/09 at 7:25am
Thread Starter 
Hey man ! have just install banshee, greate playlist and work well. Thanks

ya, i know that command, but the ouput is:
phulerock@PLR:~$ asoundconf list
Intel
default

So I try to find the device same like ... /dev/sound/dsp. And then i will try to start amarok with the output option same...same like --ouput=/dev/usbdevice

Just guess it !
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post #10 of 15
2/8/09 at 11:00am
Make sure Amarok is not running.

Run:

asoundconf set-default-card default

Load Amarok and see if it works.

Steven.
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post #11 of 15
2/8/09 at 11:12am
VLC very bad, horrible.

Jetaudio or Media Player Classic + CCCP Codec Pack + Real Alterntive/Quicktime Alternative = Very good.
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post #12 of 15
2/8/09 at 11:20am
Quote:
Originally Posted by mbd2884 View Post
VLC very bad, horrible.

Jetaudio or Media Player Classic + CCCP Codec Pack + Real Alterntive/Quicktime Alternative = Very good.
VLC is ok, I prefer Xine though.

Jetaudio isn't in my list of available downloads. Do you know where I can get the Ubuntu version?

Steven.
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post #13 of 15
2/8/09 at 11:24am
Asking the Anime community would be best. They are obsessed with having the best video playback possible. So there will probably be some with Linux. Kickassanime is a good group to ask on IRC Rizon. They are completely obsessed, each episode takes a week for them to encode, bleh, releases so slow, but so godly.
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post #14 of 15
2/12/09 at 10:26am
Your system settings didn't affect the sound in amarok because it's a KDE application. The Ubuntu system settings are for pulseaudio, the gnome audio abstraction layer.

To change the settings for amarok you will need to configure KDE's sound server. If you're running Amarok2, this will be Phonon. If you are running amarok 1.4 you will need to set the options for xine (or gstreamer if that's what you installed with amarok).
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post #15 of 15
2/12/09 at 3:02pm
Quote:
Originally Posted by mbd2884 View Post
VLC very bad, horrible.

Jetaudio or Media Player Classic + CCCP Codec Pack + Real Alterntive/Quicktime Alternative = Very good.
Aren't all of these Windows applications?

I disagree with you thinking VLC is horrible, it's a bit slower than others (in Windows) since it uses its own libraries instead of DirectShow + codecs and can't do DXVA, but it's always my go-to player when something won't play correctly/artifacting/sound delay/etc. in other players.

On Archlinux on my laptop, I use Mplayer + "codecs" + gecko-media-player (browser plugin) with no troubles, haven't used my Icon Mobile's DAC on arch yet though, only tried when I was on Ubuntu 8.04 and had no problems with it using Rhythmbox but didn't try playing any videos or anything.
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