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  1. #11
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    Perfect. Well done.

    Everything looks OK.

    DSD64-DOP and DSD128-DOP look as expected.

    DSD256-DOP is not supported. It requires a bandwidth of 705600Hz. I'm not sure if this can be enabled - e.g by a patch.

    DSD256-native would work on a capable DAC. As I said. DSD native requires just half the bandwitdh.

    Alsa thinks your DOP stream is a PCM stream.
    S32_LE just means 32bit transfer. Most USB DACs get zero-padded 32bit data.
    The DAC will cut off the 8 0-bits if required.


    Enjoy. Case closed.
    Last edited by soundcheck; 2018-04-14 at 06:05.

  2. #12
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    Quote Originally Posted by soundcheck View Post
    Perfect. Well done.

    Everything looks OK.

    DSD64-DOP and DSD128-DOP look as expected.

    DSD256-DOP is not supported. It requires a bandwidth of 705600Hz. I'm not sure if this can be enabled - e.g by a patch.

    DSD256-native would work on a capable DAC. As I said. DSD native requires just half the bandwitdh.

    Alsa thinks your DOP stream is a PCM stream.
    S32_LE just means 32bit transfer. Most USB DACs get zero-padded 32bit data.
    The DAC will cut off the 8 0-bits if required.


    Enjoy. Case closed.
    Thanks for your help!, next time i go shopping for a DAC i will choose one that does native DSD.

  3. #13
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    Quote Originally Posted by SBFan View Post
    Thanks for your help!, next time i go shopping for a DAC i will choose one that does native DSD.
    I don't consider DOP vs. NATIVE the key issue. Not sure if anybody requires more then DSD128.


    The key question IMO is if the DAC is a true-DSD DAC!!

    DACs like e.g. Topping D50 support DSD-native. However. There's a Sabre DAC chip inside. And these Sabre chips are not true-DSD DACs from what I read.

    The main issue that comes with true-DSD DACs though is the lack of digital volume control. You'd need a VC in the analog domain.
    Sabre based DSD DACs offer digital volume control though.


    I guess. There'll always be a catch at one point.

    Enjoy.

  4. #14
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    Quote Originally Posted by soundcheck View Post
    I don't consider DOP vs. NATIVE the key issue. Not sure if anybody requires more then DSD128.


    The key question IMO is if the DAC is a true-DSD DAC!!

    DACs like e.g. Topping D50 support DSD-native. However. There's a Sabre DAC chip inside. And these Sabre chips are not true-DSD DACs from what I read.

    The main issue that comes with true-DSD DACs though is the lack of digital volume control. You'd need a VC in the analog domain.
    Sabre based DSD DACs offer digital volume control though.


    I guess. There'll always be a catch at one point.

    Enjoy.
    Yes, that's indeed important, this article sheds some light on the subject:
    https://positive-feedback.com/Issue78/dsd.htm

    Burr Brown/Ti are the DAC chips with true DSD, according to that article.

    The Mojo also has digital volume control, which apparently only can be done on PCM, so yes thats a indicator for a DAC is not true-DSD.

    A analog VC is a little inconvenient these days, but then one can get off the sofa once in a while :-)

    And how about this odd DAC: http://www.lampizator.eu/Fikus/DSD_DAC.html

  5. #15
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    Mar 2013
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    Just tried the RaspBerry PI 3B+ with piCorePlayer 3.5.0 and my Chord 2qute DAC.
    I bought this board for a software project, but was excited how it works.

    It was a complete disaster both with piCorePlayer and the Rasbian Lite.

    I know chord properly is the most buggy DAC under linux and ARM when it
    comes to DOP, but this was the biggest joke so far.

    DOP is falling out every 2-5 seconds and I have some clicks on 24/96khz and higher resolution.

    I'm back on my Intel i5-7500, which are way better, only very small issues on DOP.

    My Only an best working ARM board with Chord 2qute is still my nearly 6 years old Wandboard imx6.

  6. #16
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    Hmmh. Pretty vague description.

    And if 24/96 generates issues already, you for sure will face lockups on DSD material.
    I'm running DSD256 without any issues towards an ifi USB DAC.

    I do also know that several people out there are happy with the Mojo on the PI.
    That would speak against a generic "all Chords have an issue" on the PI.

    I'd say it just needs a little more analysis and tinkering (HW and SW) from your side to get going.

    Some HW related hints:

    1. Avoid the onboard-WLAN on the PI
    2. Make sure you have a good power supply - especially for the 3B+, which consumes much more power than the 3B.
    3. Do not use USB powered DACs on the PI


    Good luck.

  7. #17
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    Hi there.

    A small update regarding bullet 1. of my last post.

    On the 3B+ I do run onboard Wifi nowadays. The Wifi part has been seriously improved on the 3B+.
    If you'd then run a USB DAC, you'll get rid of the shared use of the USB-ethernet interfaces. Which is really nice!
    Wifi connects straight to the SOC. That should work quite well.

    Since I'm running mostly i2S Audio HATs, I'm getting rid (turn off) of USB altogether,
    which saves a serious amount on the 3B+ current consumption.

    Enjoy.

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