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[SOLVED] Re: speaker-test: no correct sound output on LFE and others speakers

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On 30/04/24 at 14:07, Alexandre Rossi wrote:
> Hi,
> 
>> Basically I've the same issue described here:
>> https://askubuntu.com/questions/1180389/speaker-test-returns-all-6-channels-to-front-speakers
>>
>> The speaker-test program is provided by the alsa-utils package. I'm using
>> Debian 12 Bookworm, I've no ~/.asoundrc file. My /proc/asound/cards returns:
>>
>> ~$ cat /proc/asound/cards
>>   0 [SB             ]: HDA-Intel - HDA ATI SB
>>                        HDA ATI SB at 0xfe400000 irq 16
>>   1 [NVidia         ]: HDA-Intel - HDA NVidia
>>                        HDA NVidia at 0xfe080000 irq 57
>>
>> I've 5.1 speakers the LOGITECH Z906 audio system plugged to the PC via 3
>> jacks (left/right), (Center/Subwoofer), (Rear left/ Rear right).
> 
> I assume your cabling is right and your SB soundcard has surround out
> (3 jacks as you describe it, and not mic and line out for instance). The labels
> on the jacks would confirm that, so would the user manual of your motherboard or
> sound card.
> 
>> The issue is that speaker-test doesn't play sound to the correct speaker. If
>> I run:
>>
>> ~$ speaker-test -Dplug:surround51 -c6 -s3 -f75
>>
>> The sound comes from (Center), (Front right), (Rear left) and (Rear right)
>> speakers instead (Front right) only.
> 
> What's bothering me is that you get sound from multiple speakers while
> instructing out on only one.
> 
> The usual issues of these setups with surround analog out are:
> - channel mapping issues (driver/hardware mismatch)
> - software downmixing to stereo
> 
> There are other usual issues with surrount digital out but this is not
> your setup.
> 
> You can have a look at [1] for software fixes on this.
> 
> [1] https://alsa.opensrc.org/SurroundSound

I solved by buying a Toslink (S/PDIF) optical cable, and using thus the 
"Surround 5.1 Digital output" and unplugging the three jacks analog 
cable. Now speaker-test works nicely:

~$ speaker-test -c6 -l1 -twav

speaker-test 1.2.8

Playback device is default
Stream parameters are 48000Hz, S16_LE, 6 channels
WAV file(s)
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 32 to 349525
Period size range from 10 to 116509
Using max buffer size 349524
Periods = 4
was set period_size = 87381
was set buffer_size = 349524
  0 - Front Left
  4 - Center
  1 - Front Right
  3 - Rear Right
  2 - Rear Left
  5 - LFE
Time per period = 8,720806

maybe it was a hardware issue with the DAC of my Logitech Z906, it seems 
that with the three jacks analog cable it downmix to stereo, thanks anyway.

Cheers,
-- 
Franco Martelli

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Thread

speaker-test: no correct sound output on LFE and others speakers Franco Martelli <martellif67@gmail.com> - 2024-04-29 21:40 +0200
  Re: speaker-test: no correct sound output on LFE and others speakers Alexandre Rossi <niol@zincube.net> - 2024-04-30 14:10 +0200
    Re: speaker-test: no correct sound output on LFE and others speakers Franco Martelli <martellif67@gmail.com> - 2024-05-01 15:30 +0200
      Re: speaker-test: no correct sound output on LFE and others speakers Alexandre Rossi <niol@zincube.net> - 2024-05-02 09:20 +0200
        Re: speaker-test: no correct sound output on LFE and others speakers Franco Martelli <martellif67@gmail.com> - 2024-05-06 17:40 +0200
          Re: speaker-test: no correct sound output on LFE and others speakers Alexandre Rossi <niol@zincube.net> - 2024-05-07 12:00 +0200
    [SOLVED] Re: speaker-test: no correct sound output on LFE and others  speakers Franco Martelli <martellif67@gmail.com> - 2024-05-17 16:20 +0200

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