DigiOne options and Passthrough

1st Official Post

    Hi,

    I want to set up a sound card on my Raspberry 4. (Allo DgiOne)

    I modified the config.txt. I can choose the card from the outputs, it also has a sound. (There are 3 options ... I don't know which one is the best.)

    The pop-up menu, is empty in the passthrough menu.

    I would listen to music with the Tidal2 plugin. Is there a way to listen without resampling? I would also turn off the volume control. I just want the "raw" source. Anyone who has experience with settings should help me.

    Thanks!

    (The amplifier is Audilab 6000a)

    Thanks for the tip. I can't find out exactly what can be set with this alsamixer.

    the output in SSH "aplay -l" :

    :~ # aplay -l

    **** List of PLAYBACK Hardware Devices ****

    card 0: sndallodigione [snd_allo_digione], device 0: Allo DigiOne HiFi wm8804-spdif-0 [Allo DigiOne HiFi wm8804-spdif-0]

    Subdevices: 1/1

    Subdevice #0: subdevice #0

    SSH "alsamixer". -not found.

    I understand. Then this feature is not what I was thinking. I think it is resampling because when I select in the options how many khz the maximum frequency should be, I see that value on the display of my DAC. Obviously, this stream isn’t coming from Tidal. So it does not send the native stream to the output. That's why I thought he was resampling.

    • Official Post

    OK, then you're probably right: The RPi must down-sample the stream somewhere. An RPi doesn't have a very fast data bus, so I think the down-sampling happens due to hardware limitation. LE usually deals with A/V streams, so my advice is to use an audio-optimized OS. Such an OS might be slow on video playback, but has the ability to deal with higher audio bit rates.

    There already is an LE audio mod for RPi 2/3, which can deal with higher audio bit rates. Maybe those devs will switch to RPi 4 next.