Holo Audio Spring DAC Measurements

Discussion in 'Source Measurements' started by Hands, Nov 21, 2016.

  1. Hands

    Hands Overzealous Auto Flusher - Measurbator

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    Used a Surface Pro 1 + Focusrite Scarlett 2i2 (1st gen) for measurements. Note, this is an incredibly modest rig, so don't expect AP-level results. Source is Soundaware D100 Pro into AES on Spring. Spring is mostly level 3 but doesn't have the upgrade PSU cap right up front, the silver wiring (does have silver transformer), or the better fuse.

    Balanced output and input, with 10dB XLR attenuator at input of 2i2. Otherwise signal gets too and distorts the ADC. Note that because I had to manually adjust the gain after, that could add noise or affect results, plus means channels won't be precisely matched. Similarly, -3dB on most tests for my strikes a good balance between being less likely to overload the DAC chip/module, less likely to overload the ADC, and still provides similar results to 0dB or -1dB signals. (If I'm too far out from baseline requirements, please move to unsanctioned sub-forum.)

    In this case, since the Spring has a hotter output than the Menuet, I had to raise the gain less on the ADC, which could contribute to the lower noise.

    You can find other Spring measurements with a professional measurement system on the Kitsune HiFi website. In a lot of cases, the Spring totally maxed out my ADC (a good thing! but better results are out there!).


    1KHz Sine at -3dB, 16/48

    1 Spring - 16 48 - 1k -3dB.PNG


    1KHz Sine at -3dB, 16/48, 10Hz to 1KHz view

    2 Spring - 16 48 - 1k -3dB 10Hz-1K Spectrum.PNG


    1KHz Sine at -3dB, 16/48, with ADC set to 96KHz for extended spectrum view

    3 Spring - 16 48 - 1k -3dB Long Spectrum.PNG


    1KHz Sine at -60dB, 16/48

    4 Spring - 16 48 - 1K -60dB.PNG


    1KHz Sine at -90.31dB, 16/48

    5 Spring - 16 48 - 1K -90dB.PNG


    1KHz Sine at -90.31dB, 16/48 - Note the 3 discrete steps. A little noisy from the ADC, but looks good overall.

    6 Spring - 16 48 - 1K -90dB Sine.PNG
     
    Last edited: Nov 21, 2016
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  2. Hands

    Hands Overzealous Auto Flusher - Measurbator

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    1KHz Sine at -90.31dB, 24/48

    7 Spring - 24 48 - 1k -90dB.PNG


    1KHz Sine at -90.31dB, 24/48 - Note the 24-bits leaves us with a relatively nice sine wave. Some noise from ADC.

    8 Spring - 24 48 - 1K -90dB Sine.PNG


    1KHz Sine at -100dB, 24/96 - ADC wasn't really sure how to handle this one...

    9 Spring - 24 96 - 1K -100dB.PNG

    Mostly noise, but you can still see the sine wave in there. Menuet looked similar. Cheap ADC can only go so far, but it's good to see this isn't total noisy garbage even still!

    10 Spring - 24 96 - 1K -100dB Sine.PNG


    60Hz Sine at -3dB, 16/48

    11 Spring - 16 48 - 60Hz -3dB.PNG


    60Hz Sine at -3dB, 16/48, zoomed to show 10Hz to 1KHz

    12 Spring - 16 48 - 60Hz -3dB Zoom.PNG Reserved
     
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  3. Hands

    Hands Overzealous Auto Flusher - Measurbator

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    19KHz Sine at -3dB, 16/48 with ADC at 96KHz

    13 Spring - 16 48 - 19k -3db.PNG


    13KHz and 14KHz Sines at -3dB, 16/48 with ADC at 96KHz

    14 Spring - 16 48 - 13k 14k.PNG


    19KHz and 20KHz Sines at -3dB, 16/48 with ADC at 96KHz

    15 Spring - 16 48 - 19k 20k.PNG


    250Hz and 9KHz Sines, 4-to-1 ratio, 16/48

    16 Spring - 16 48 - 250hz 9k 4-to-1.PNG


    Jitter (ARTA JTest) at 16/48

    17 Spring - 16 48 - Jitter.PNG


    Jitter (ARTA JTest) at 24/48 - Probably maxed out my ADC

    18 Spring - 24 48 Jitter.PNG
     
    Last edited: Nov 21, 2016
  4. Hands

    Hands Overzealous Auto Flusher - Measurbator

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    Again, please check out the other published measurements for the Spring at the Kitsune HiFi site. Clearly my ADC is the weak link here in most cases, but I can confidently say this is an overall excellent measuring, non-oversampling DAC. I clarify that NOS point because, as is true of most NOS DACs, distortion tends to creep up with higher frequency signals. Note the 19KHz sine or treble IMD tests. Still, this is a minor, and expected, blemish among otherwise excellent results and shouldn't discourage anyone.

    RMAA results available on request. PM me. Won't publish here. You'll need 6.4.1. Can offer a different baseline or be used to direct compare against the Menuet.
     
    Last edited: Nov 21, 2016
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  5. Armaegis

    Armaegis Friend

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    C'mon Hands, time to get your hands on a Prism or Lynx interface for your measurements :cool:
     
  6. Hands

    Hands Overzealous Auto Flusher - Measurbator

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    Buy me one! :p
     
  7. Armaegis

    Armaegis Friend

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    There's actually a Prism Lyra1 up here in Canada at a nice price...
     

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