Re: 6 Channel Audio

["Pigeon" <jah.pigeon@ukonline.co.uk>]

----- Original Message -----
From: Sridhar M.A. <mas@uomphysics.net>
Subject: 6 Channel Audio


> Hi,
>
> I just purchased a Cmedia 8738 based 6 channel audio card. Alsa has
> support for this card. I am able to get the sound, in 4 of the six
> channels (front and rear). In the Center +Subwoofer channel, I am only
> getting a faint signal which when fed to an amplifier does not produce
> good sound. The center channel also is very faint and too much of
> crackling noise is heard. Has anybody else set up this card for good
> reproduction of centre+subwoofer? What are the settings/options for the
> snd-cmipci module that needs to be done?
>
> My /etc/modules.conf has the following lines:
>
>   alias char-major-116 snd
>   options snd snd_major=116
>
>   alias snd-card-0 snd-cmipci
>   options snd-cmipci snd_index=0 snd_id="C-Media-8738-6Ch"
>   alias sound-slot-0 snd-card-0
>   options snd_pcm_hw_params_set_access(pcm, hw,
SND_PCM_ACCESS_RW_INTERLEAVED)
>   options snd_pcm_hw_params_set_format(pcm, hw, SND_PCM_FORMAT_S16_LE)
>   options snd_pcm_hw_params_set_channels(pcm, hw, 6)
>
>   alias char-major-14 soundcore
>   alias sound-service-0-0 snd-mixer-oss
>   alias sound-service-0-1 snd-seq-oss
>   alias sound-service-0-3 snd-pcm-oss
>   alias sound-service-0-8 snd-seq-oss
>   alias sound-service-0-12 snd-pcm-oss
>
> The options are from the alsa-doc for cmipci cards. The only change that
> I have done is change 4 to 6 on the last option (as the doc mentions a 4
> channel card).
>
> Regards,
>
> --
> Sridhar M.A.
>
> QOTD:
> I've heard about civil Engineers, but I've never met one.
>
>From an _audio hardware_ point of view it sounds as if your centre channel
is reproducing L-R (or R-L). Is there a lack of bass on it? - "yes" would
confirm the theory.
This might help someone else give you some software pointers.
I have just bought such a card myself so if I get the same problem and solve
it I'll post results.

Pigeon