Two speaker mode

Two speaker mode

[Carlos Pita]

Hi!

I have an audigy sound card that I have been using without problems under win 
xp via the kx drivers. Now I'm trying to get it working with alsa 1.0.6 
emu10k1 driver. The card is detected and I can hear sound but at a low volume 
(it's not a mixer problem: all slides are reaching the top) . My external 
amplifier is conected to the front analog output jack but the other two 
(center, rear outputs) are playing too. I have configured the mixer for 
analog output. I guess I should put the card into 2 speaker mode or something 
similar so that the audio output would not be divided between the 3 outputs 
but only sent to the frontal one. I don't know how to achieve this, can you 
help me?

Thank you in advance.
Regards,
Carlos


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Re: Two speaker mode

[Peter Zubaj]

I think, this is same thing as:

https://bugtrack.alsa-project.org/alsa-bug/view.php?id=324

Linux drivers only attenuate signals. Creative drivers probably
amplify signals or maybe there is bug in ALSA DSP code.
I will look on this, but for now I don't have time to do this.

Peter Zubaj


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Re: Two speaker mode

[Carlos Pita]

Following is an excerpt from the emu-config man page 
(http://sourceforge.net/projects/emu10k1). Note that the option -B (boost) 
supports your hypothesis about creative drivers amplifying signals (specially 
when this seems to be the only option related to 2/6 speaker mode switching) 
but suggests that output level could be different for different outputs, no 
merely a copy (a 12dB boost on the analog front out only). Anyway a 12db 
boost on every output would be exactly the same for practical purposes.

"""
emu-config is used to configure emu10k1 based soundcards.

[...]

-B on/off or boost=on/off

  Set a 12dB boost on the analog front out either 'on' or 'off'. This
option is only valid for SBLive cards.
"""

> Rear and center is copy of front and there is not lost.
> If there is lost, then this is bug in dsp code. But I think, that
> Creative drivers amplify signals.
>
> > Perhaps the volume I'm getting is ok for 6 speaker mode 
> > but just too low for 2 (because of the outputs being lost in the couple of 
> > unused jacks: center & rear). So if that is case what I need is to specify 
> > the speaker mode. I think that emu-tools lets you do that kind of stuff.


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Re: Two speaker mode

[Lee Revell]

On Thu, 2004-10-21 at 03:09, Peter Zubaj wrote:
> I think, this is same thing as:
> 
> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=324
> 
> Linux drivers only attenuate signals. Creative drivers probably
> amplify signals or maybe there is bug in ALSA DSP code.
> I will look on this, but for now I don't have time to do this.

Carlos' original mail user said he was using the kX drivers not the
Creative drivers.  I do not think these amplify signals.  

Try emailing Eugene from the kX project, they are generally helpful. 
They have signed NDA with Creative so they can't answer everything but
they should be able to tell you this.

Lee 



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