Soekris "dac1541": DAC/Amp - Stream of Consciousness Impressions

Discussion in 'Headphone Amplifiers and Combo (DAC/Amp) Units' started by Torq, Jul 27, 2017.

  1. ergopower

    ergopower Friend

    Friend
    Joined:
    Mar 21, 2018
    Likes Received:
    359
    Dislikes Received:
    9
    Trophy Points:
    63
    Location:
    South Central PA
    RS-232 is older than dirt. It's only used up to about 20 Kbps. With Bell wire, it will run 50 ft or more.
     
  2. randytsuch

    randytsuch Facebook Friend

    Joined:
    Oct 13, 2017
    Likes Received:
    194
    Dislikes Received:
    2
    Trophy Points:
    43
    Location:
    Los Angeles, Ca
    Yeah, I know.
    But if the interface works fine is you are slowly typing, but has problem sending a file, seems to me that it could be a data corruption problem.
     
  3. ergopower

    ergopower Friend

    Friend
    Joined:
    Mar 21, 2018
    Likes Received:
    359
    Dislikes Received:
    9
    Trophy Points:
    63
    Location:
    South Central PA
    More likely an implementation problem. RS-232 is not anywhere near as defined as Ethernet, USB, etc. It's only defined for Physical Layer, if I remember correctly. There are lots of ways to configure packets in RS-232: and if each end is not designed around the same protocol, there can be errors or complete silence.
     
  4. randytsuch

    randytsuch Facebook Friend

    Joined:
    Oct 13, 2017
    Likes Received:
    194
    Dislikes Received:
    2
    Trophy Points:
    43
    Location:
    Los Angeles, Ca
    So you made me check what I did years ago lol
    Baud rate is 115k, protocol is xmodem, and my cable was longer than a foot, maybe 2-3 feet long. It doesn't have the feel of a protocol error to me, imho a protocol error would either work or not.
    That said, we can agree to disagree.
     
  5. ergopower

    ergopower Friend

    Friend
    Joined:
    Mar 21, 2018
    Likes Received:
    359
    Dislikes Received:
    9
    Trophy Points:
    63
    Location:
    South Central PA
    Hey, I am no expert in RS-232. It got used around our labs a lot, and basically between 2 devices that were designed to talk to each other, would work regardless of how shitty the cable assembly was.

    The fact that it worked eventually is pretty mystifying. I am way out of my depth in troubleshooting anything like that.
     
  6. TheIceman93

    TheIceman93 El pato-zorro

    Friend
    Joined:
    Dec 17, 2016
    Likes Received:
    1,220
    Dislikes Received:
    30
    Trophy Points:
    93
    Location:
    SoCal
    Ya, no idea what was going on. It was my first attempt at doing the firmware update. Honestly not sure. My unit is headed back to Soren for the coax and volume pot upgrade. He said he would look everything over and I'm sure he'll have to load the firmware again after the upgrade. Soren's customer service is top notch.

    By the way, is there a version 1.21 of the firmware? I could only find 1.20.
     
  7. TheIceman93

    TheIceman93 El pato-zorro

    Friend
    Joined:
    Dec 17, 2016
    Likes Received:
    1,220
    Dislikes Received:
    30
    Trophy Points:
    93
    Location:
    SoCal
    Where is this instruction page?
     
  8. Syzygy

    Syzygy Friend

    Friend
    Joined:
    Jun 13, 2018
    Likes Received:
    2,110
    Dislikes Received:
    2
    Trophy Points:
    93
    Location:
    DFW, Texas
    RS232 can also either use hardware or software flow-control. Baud rate, parity, control flow all have to be set properly.
     
  9. randytsuch

    randytsuch Facebook Friend

    Joined:
    Oct 13, 2017
    Likes Received:
    194
    Dislikes Received:
    2
    Trophy Points:
    43
    Location:
    Los Angeles, Ca
  10. boxerfan88

    boxerfan88 Rando

    Joined:
    Dec 28, 2017
    Likes Received:
    3
    Dislikes Received:
    0
    Trophy Points:
    3
    Location:
    Singapore
    http://soekris.dk/download/dac1541/
     
    Metro and Jinxy245 like this.
  11. Metro

    Metro Friend

    Friend
    Joined:
    Dec 27, 2016
    Likes Received:
    990
    Dislikes Received:
    7
    Trophy Points:
    93
    Location:
    San Francisco
  12. soekris

    soekris MOT - Soekris Engineering

    Friend
    Joined:
    Mar 25, 2016
    Likes Received:
    797
    Dislikes Received:
    1
    Trophy Points:
    93
    Location:
    Denmark
    dac1541 firmware rev 1.21 is at http://www.soekris.dk/download/dac1541/1541_full_121.skr
    It's not officially released yet, as those who really wanted it at first haven't provided feedback....
    Btw, the only difference compared to 1.20 is a change in some clocking circuit as a few DACs had issues....
     
    Syzygy, Jinxy245 and Baten like this.
  13. mocenigo

    mocenigo Rando

    Joined:
    Sep 26, 2017
    Likes Received:
    14
    Dislikes Received:
    0
    Trophy Points:
    8
    Location:
    Munich
    No significant change for me wrt 1.20. It stil has problems with DSD under mpd (both 0.20 and 0.21) on ARM-32 - the problem may lie with mpd, actually. No problem whatsoever with Audirvana on my Mac. Sound is great as ever. This is not the most silent DAC [1] but it has that "high mass turntable" sound that I really love.

    [1] I have to put my head inside the Le Cleach horns to hear the faintest of the faintest crackles. The horn is driven by a tweeter with 110Db sensitivity, following a 10Db attenuation in the Xover via an autotransformer, and 26Db of power amp gain. The amps are directly connected to the DAC out, with only separation transformers in between otherwise there's s buzz. Mind you, if I move back 50 cm there is no audible noise. And no noise in the headphones as well. Other DACs may *measure* better and produce no faint crackle in the above quite artificial situation, but who cares, if they do not sound as good.
     
    brencho likes this.
  14. adeadcrab

    adeadcrab Acquaintance

    Joined:
    Jul 26, 2019
    Likes Received:
    90
    Dislikes Received:
    2
    Trophy Points:
    18
    Location:
    Australia
    Want to order a new 1541 in time for the New Year.. The US reseller, modhouseaudio, claims they are waiting on new units, and I have not had a reply from the official Soekris email. Excited to order a unit soon.. anyone else in the same boat?
     
  15. brencho

    brencho Friend

    Friend
    Joined:
    Dec 18, 2015
    Likes Received:
    7,426
    Dislikes Received:
    12
    Trophy Points:
    113
    Location:
    LA
    Still enjoying mine, good unit, good value, good for your health, good for you.
     
    Last edited: Dec 13, 2019
  16. mocenigo

    mocenigo Rando

    Joined:
    Sep 26, 2017
    Likes Received:
    14
    Dislikes Received:
    0
    Trophy Points:
    8
    Location:
    Munich
    I am very sad for the folks at ASR that will never get to listen to it because it does not measure like some of their preferred DACs. And I have heard a few of their favourites which, I can tell, were definitely not enjoyable.
     
    adeadcrab and brencho like this.
  17. Otto

    Otto Rando

    Joined:
    Jun 1, 2018
    Likes Received:
    3
    Dislikes Received:
    16
    Trophy Points:
    3
    Location:
    Hongkong
    It is possible to make dop over coaxial ?
     
  18. Baten

    Baten Friend

    Friend
    Joined:
    Mar 18, 2018
    Likes Received:
    723
    Dislikes Received:
    3
    Trophy Points:
    93
    Location:
    Belgium
    DSD over s/pdif is limited to dsd64 (using DoP, yes).
     
  19. Otto

    Otto Rando

    Joined:
    Jun 1, 2018
    Likes Received:
    3
    Dislikes Received:
    16
    Trophy Points:
    3
    Location:
    Hongkong
    I don’t think 1541 support dsd over S/pdif dop now (firmware 1.20)
     
  20. soekris

    soekris MOT - Soekris Engineering

    Friend
    Joined:
    Mar 25, 2016
    Likes Received:
    797
    Dislikes Received:
    1
    Trophy Points:
    93
    Location:
    Denmark
    The dac1541 only support DSD over the USB interface. I'm planning to add support for DoP over SPDIF in a future firmware release.
     
    Jinxy245, Hammy, rtaylor76 and 2 others like this.

Share This Page