5+1 audio question

balrog · 2005-10-06 11:01:34

Hi,
my second question...

Got sndcard via8237 i think (snd-via82xx), alsa driver installed.
When I enter alsamixer and unmute Center and LFE, play some mp3 and change volume of center or LFE nothing happens.

Would like to know, how to expand my sound from 2 speakers to all my speakers including subwoofer.

Would you help?

THX

Soule · 2005-10-06 14:17:14

balrog wrote:

Hi,
my second question...
Got sndcard via8237 i think (snd-via82xx), alsa driver installed.
When I enter alsamixer and unmute Center and LFE, play some mp3 and change volume of center or LFE nothing happens.
Would like to know, how to expand my sound from 2 speakers to all my speakers including subwoofer.
Would you help?
THX

Edit or create a /etc/asound.conf and put this into it:

pcm.duplicate {
type plug
slave.pcm "surround51"
slave.channels 6
route_policy duplicate
}

this only creates the pcm-device-thingy, if you want to use it as default pcm device, then instead add:

pcm.!default {
type plug
slave.pcm "surround51"
slave.channels 6
route_policy duplicate
}

Should work will all programs that use alsa. This config is only for 5.1 systems, for 7.1 systems change to "surround71" and "slave.channels 8", but I guess from the title of the thread that you have a 5.1 system.

balrog · 2005-10-07 08:14:51

This should work also for center speaker and rear speakers? I used the firt way you wrote, but think only front left and right and subwoofer works, but subwoofer volume is low although in alsamixer I set LFE on max volume.

8)

balrog · 2005-10-08 22:28:04

Soule:

man, seems to me not to work... I used your first version... When I reinstall arch, install alsa, left and right front speaker and subwoofer works, but when i change level of LFE in alsamixer nothing happens.

When I add your script into alsa.conf it is the same. Any other steps needed to work this or what?

THX

Deciare · 2005-10-08 22:44:20

All the MP3s I've ever come across are recorded in stereo. If you want surround sound from them, you'll probably need an external audio receiver that an upmix stereo signals or some kind of software that can do it for your soundcard. (I'm going the external receiver route, so I can't help you with the software.)

Games (OpenAL?) and DVD movies (AC3 passthrough, since my soundcard doesn't have a surround decoder built-in) are more the kind of thing from which I'd be expecting surround sound.

balrog · 2005-10-08 22:52:27

Decaire:

Yes i know, that mp3 are in stereo, but in windows i have EXPANDER function which sorrounds all sounds into 5+1 including mp3. I'm asking if that is possible in arch

Deciare · 2005-10-08 22:56:01

Ah, I see. Off-topic question, but in Windows, where would you enable this "EXPANDER"?

balrog · 2005-10-08 23:03:01

Decaire:

ehm when I install sound driver in win I have Adeck in systray (which is app for soundcard) and here I can do this.

balrog · 2005-10-08 23:05:23

And what about alsamixer... the option LFE does a shit when i change the volume

Deciare · 2005-10-08 23:12:52

I know the feeling. Since I use only the spdif out port, every single mixer control except for Wave does nothing for me.

balrog · 2005-10-08 23:35:49

So how do you solve this?

Deciare · 2005-10-08 23:39:56

Turning up the volume knob on the subwoofer and setting the receiver's subwoofer channel to +5 dB. Brute force solution, really. What's your speaker setup like?

balrog · 2005-10-08 23:43:08

I don't exactly know what you mean, but on subwoofer I can contron only volume and bass

Arch Linux

#1 2005-10-06 11:01:34

5+1 audio question

#2 2005-10-06 14:17:14

Re: 5+1 audio question

#3 2005-10-07 08:14:51

Re: 5+1 audio question

#4 2005-10-08 22:28:04

Re: 5+1 audio question

#5 2005-10-08 22:44:20

Re: 5+1 audio question

#6 2005-10-08 22:52:27

Re: 5+1 audio question

#7 2005-10-08 22:56:01

Re: 5+1 audio question

#8 2005-10-08 23:03:01

Re: 5+1 audio question

#9 2005-10-08 23:05:23

Re: 5+1 audio question

#10 2005-10-08 23:12:52

Re: 5+1 audio question

#11 2005-10-08 23:35:49

Re: 5+1 audio question

#12 2005-10-08 23:39:56

Re: 5+1 audio question

#13 2005-10-08 23:43:08

Re: 5+1 audio question

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