Schiit Modi MB technical measurements

Discussion in 'Source Measurements' started by atomicbob, Aug 15, 2016.

  1. dubiousmike

    dubiousmike Friend

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    @atomicbob Many thanks for your continued work in taking and sharing these measurements! With respect to dynamic range, the difference between the usb and spdif/toslink inputs is interesting. Looks like the numbers are actually pretty similar for mimby and bimby over spdif, but bimby is substantially better via usb.
     
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  2. Huxleigh

    Huxleigh Wow, I made it this far without being a friend?

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    I mean, I could maybe get having one less VAC. Understandable, can happen to anyone. But two!?

    TWO LESS GODDAMN VACs!? :mad:

    For shame, @schiit. For shame... :p
     
    Last edited: Aug 17, 2016
  3. batriq

    batriq Friend

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    @atomicbob Thank you for the detailed/awesome measurements. If I'm reading this correctly SPDIF has a lower residual noise floor on the Modi MB. It's interesting then that the USB and USB->SPDIF measure similarly with the higher noise floor. Could this indicate an issue with the input USB signal?
     
  4. Clemmaster

    Clemmaster Friend

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    You can always mod the Modi to accept DC input :rolleyes:
     
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  5. Armaegis

    Armaegis Friend

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    But... but... you're trading 2 vacs for 1000 (one thousand!) mas.

    So yeah, if you do the math that's (14/16)*(1500/500) = 2.625

    Numbers don't lie people. That's a 262.5% increase in performance.
     
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  6. Huxleigh

    Huxleigh Wow, I made it this far without being a friend?

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    [​IMG]
     
  7. Scott Kramer

    Scott Kramer Friend

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    Yikes this is a good technical thread... should cut out from the troll down, funny stuff but need to clean 'er up :D
     
    Last edited: Aug 17, 2016
  8. aufmerksam

    aufmerksam Friend

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    Actually, you could probably just swap the troll hunting in this thread with the excellent discussion on pre- and post-ringing in the impressions thread. It's about the same number of total posts.
     
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  9. Slex

    Slex Rando

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    Thanks for your feedback, in your opinion , is having a quieter and cooler AC transformer then stock wallwart achieve in a better sound performance?

    For those like to know, been using the schiit wallwart around 4 days before i replaced it.
     
  10. brencho

    brencho Good Friend (Moderator)

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  11. The Alchemist

    The Alchemist MOT: Schiit - Here to help!

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    Thank you for your outstanding work and measurements @atomicbob
     
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  12. TRex

    TRex Wow, I made it this far without being a friend?

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    I'm curious as well. If the high USB noice is Momby's problem, the USB->SPDIF/COAX noise result would be low. But then, the Bimby USB noise result is low with the same input device.

    Related to above: will Wyrd lower Momby USB noise? AFAIK, Wyrd improves source signal, not DACs.
     
    Last edited: Sep 5, 2016
  13. Ash1412

    Ash1412 Friend

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    If toslink doesn't transmit noise through the cable, where could this be coming from? I think @atomicbob had the usb input plugged in simultaneously which activated the usb receiver and caused this noise. No other way for noise to get in I could think of
     
  14. Soliloqueen

    Soliloqueen Friend

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    fyi, the absolute mess at -90dbFS is normal and expected behavior. It's a multibit dac. it plays what it gets. it doesn't have enough bits to reproduce the waveform, so the output value is just wherever the waveform is at the moment it's sampled. since the waveform is changing so much, that's a whole lot of fucking noise.

    it's like if you resize a big image really small using only nearest neighbor filtering...you're gonna end up with garbage.
     

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