New low cost soekris dac1221

Discussion in 'Digital: DACs, USB converters, decrapifiers' started by soekris, Jun 8, 2024.

  1. soekris

    soekris MOT - Soekris Engineering

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    Looong time ago I talked about making a new low cost discrete R-2R DAC, to replace the discontinued dac1321, and now the dac1221 is finally ready to ship.... It's basically an improved and cost optimized dac1321, unfortunately the price have gone up a little, due to inflation.... Please visit www.soekris.dk for more information.

    It there are interest, I'll be happy to put one up for a loaner tour...
     
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  2. rhythmdevils

    rhythmdevils MOT: rhythmdevils audio

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    Thanks for supporting SBAF with a loaner! We all really appreciate it!
     
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  3. zottel

    zottel Friend

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    Questions regarding possible use with HQPlayer:

    Can the internal filters be switched off/will they not be in use when the maximum input rate of 352/384 kHz is used?

    How is DSD input treated? Will it be converted to PCM or is there a separate D/A converter chip for DSD? If the latter, are there any filters used and can they be switched off?

    (This isn’t supposed to mean that I expect the internal filters to be crap! But if I want to use HQPlayer, it’s always better if nothing else changes the signal afterwards.)
     
  4. soekris

    soekris MOT - Soekris Engineering

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    There is a very soft filter....
    DSD is converted to PCM using a required digital filter, cutoff depending of DSD rate....
     
  5. crenca

    crenca Friend

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    Can you say more? If I understand correctly, for PCM you used an open source (SoX?) filter (linear or "minimum" phase I do not know - I suspect based on user impressions a minimum, but only a guess) and up-sampled to 8x before sending it to the ladder...
     
  6. soekris

    soekris MOT - Soekris Engineering

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    from dac1221 manual:

    “FILTER” button: Select between the different reconstruction filters. Hold for minimum 4 seconds to store the current volume level and reconstruction filter selection.
    “FILTER” LED color shows the current reconstruction filter selected
    Red Linear Phase filter, also called brickwall filter
    Orange Mix between Linear and Minimum Phase filter
    Green Minimum Phase filter, also called butterworth filter
    Off Soft Minimum Phase filter, a soft butterworth filter
    The filters can be modified, a file is on the website, but no more docs than discussed in the loong diyaudio threads....
     
    Last edited: Jun 11, 2024

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