Schiit Modi 3 DAC Measurements

Discussion in 'Source Measurements' started by purr1n, Sep 21, 2018.

  1. purr1n

    purr1n Finding his inner redneck

    Staff Member Friend
    Joined:
    Sep 24, 2015
    Likes Received:
    35,482
    Dislikes Received:
    54
    Trophy Points:
    113
    Location:
    Calabasas, CA
    Modi 3 1kHz 0db and Harmonics
    Modi 3 1kHz after-1.jpg
    Spikes at 2kHz and 3kHz well under -105db down. Fairly clean upward.

    Modi 3 1kHz 0db
    Modi 3 1kHz-1.jpg
    AC line noise at 60, 180, 360Hz, etc. All well below -110db. I wouldn't worry about it. The Modi 2 Uber with the AC brick on the wall didn't exhibit this behavior. The Topping D30 (which also uses a switcher), exhibited similar AC line noise. UPDATE: https://www.superbestaudiofriends.o...iit-modi-3-dac-measurements.6856/#post-225681

    Modi 3 THD vs dbFS
    Modi 3 THD-1.jpg

    Modi 3 1kHz Linearity
    These tests have been retired by Stereophile, et. al. In the 90s, people thought they were the bees knees, telling us everything we needed to know. They don't tell us much unless there is something totally off. Besides, to do them properly, we need to have a notch filter around 1kHz. (The measurements boxes takes RMS as the level value, so if there is distortion, it gets lumped into the RMS value. Keep in mind we are measuring linearity of X signal, not distortion.) The AverLAB won't do this, but I know the AP555 does. But I will include it for the heck of it.
    Modi 3 Linearity-1.jpg

    A few more coming up...
     
    Last edited: Sep 21, 2018
    ultrabike, numbercube, Vtory and 3 others like this.
  2. purr1n

    purr1n Finding his inner redneck

    Staff Member Friend
    Joined:
    Sep 24, 2015
    Likes Received:
    35,482
    Dislikes Received:
    54
    Trophy Points:
    113
    Location:
    Calabasas, CA
    Modi 3 FR 44.1kHz
    Modi 3 FR 44.1-1.jpg
    Interesting. I could have sworn that Schiit DACs in the past had a sharper rolloff. I might need to redo this or check some settings.

    Modi 3 FR 96kHz
    Modi 3 FR 96-1.jpg

    Modi 3 Distortion at 0db Across 20-20kHz Frequency Range
    Modi 3 D vs F-1.jpg
     
    Decomo, ultrabike and Cspirou like this.
  3. purr1n

    purr1n Finding his inner redneck

    Staff Member Friend
    Joined:
    Sep 24, 2015
    Likes Received:
    35,482
    Dislikes Received:
    54
    Trophy Points:
    113
    Location:
    Calabasas, CA
    I realized I used some cheapo Chinese USB to wall adapter because I couldn't find the one Schiit provided. Here are the results with the a Belkin USB to wall adapter. No more huge AC line related spikes.
    Modi 1kHz redo-1.jpg
     
    ultrabike, Cspirou and SoupRKnowva like this.
  4. purr1n

    purr1n Finding his inner redneck

    Staff Member Friend
    Joined:
    Sep 24, 2015
    Likes Received:
    35,482
    Dislikes Received:
    54
    Trophy Points:
    113
    Location:
    Calabasas, CA
    And this one is from using the computer USB (a cheap HP mini-tower) for power. Not as bad as the el-cheapo China switcher, but not as good as the Belkin.
    Modi 3 computer USB-1.jpg
     
  5. Cspirou

    Cspirou They call me Sparky

    Friend
    Joined:
    Sep 27, 2015
    Likes Received:
    3,251
    Dislikes Received:
    4
    Trophy Points:
    113
    Location:
    Irvine,CA
    Seems like there actually would be a measurable benefit to using a Wyrd, though likely inaudible.
     
  6. numbercube

    numbercube Acquaintance

    Joined:
    Sep 29, 2015
    Likes Received:
    58
    Dislikes Received:
    0
    Trophy Points:
    18
    Location:
    Germany
  7. ultrabike

    ultrabike Measurbator - Admin

    Staff Member Friend
    Joined:
    Sep 25, 2015
    Likes Received:
    6,724
    Dislikes Received:
    14
    Trophy Points:
    113
    Location:
    Irvine CA
    From all this, I read about 0.001% THD, which is indeed what is published @ Schiit's site. It seems the new Modi offers more input options.
     

Share This Page