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iFi audio Pro iDSD (Official) - NEW Firmware - MQA and more.

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  1. iFi audio
    iFi audio Stay updated on iFi audio at their sponsor page on Head-Fi.
     
    https://www.facebook.com/iFiAudio/ https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ info@ifi-audio.com
  2. flyte3333
    Hi Peter, this bug is Linux source related.

    Not related to a Mac or Windows source.

    And as Kii Audio (who found the XMOS bug and the fix) said:

    “If your vendor states its device is not supporting Linux, they are hiding and hoping for the storm to pass. Good riddance to manufacturers who do not stand behind their product, especially when the (not so easy to find) solution is spoon fed to them. In case one of these vendors is willing but incapable of implementing this fix, they can contact me to see If I can help them out."
     
    Last edited: Jan 14, 2019
  3. peterjgross
    Understood. I use UPnP but until yesterday my UPnP server was running on Windows. I now use a UPnP server on QNAP which actually is Linux. I see the issues i described whether the UPnP server runs on Windows or on QNAP/Linux.

    Whatever it is - there is some issue with the Pro iDSD when streaming to it over network of from locally attached SD/disk. I have better success streaming the same source to my Marantz or Pioneer receivers even though - when it works the Pro iDSD sounds better.
     
  4. flyte3333
    Noted. This is not the same XMOS bug but you definitely have a problem that I hope iFi sorts out for you.
     
    Last edited: Jan 14, 2019
  5. lichie
    It has been a few months since I made this post and I should follow up with how I solved it.

    It turned out the problem seemingly was caused by high amounts of USB noise from my computer's motherboard. I eventually connected the DAC to my laptop and all the problems went away.
    I purchased an iFi Audio iDefender 3.0 and added that to the USB chain and all the popping problems went away.
     
    captblaze likes this.
  6. bluesaint
    Now that's actually fascinating.. I thought iDSD Pro does the following with all inputs:
    1. Galvanic Isolation
    2. Buffers, Reclocks and Regenerates the signal
    I'm curious with those two operations, how are the high amount of USB noise affects the sound.... @iFi audio ?
     
  7. gordec
    Pro iDSD has one of the best USB inputs. However, if your USB source is noisy, it limits the DAC's upside. I use a dedicated USB card which is powered by the Uptone JS2 LPS which also powers the Pro iDSD. If you want to go crazy with noise reduction like me, you add a conditioner like Niagara 1000 and Electra 7 power cables. For noise, it's not just how quiet the background is. It also has to do with all analog signals are converted through your chain. Noise can distort the wave form since all digital signals are not perfect sine waves. They are actually square waves which the DAC has to interpret into sine waves.
     
  8. flyte3333
    Did you need iDefender 3.0 with the laptop for all problems to go away?

    Or does the laptop alone as USB source make all the problems go away?
     
  9. bluesaint
    if he used iDefender and worked means he has a ground related noise issue since thats what iDefender 3.0 do. IFI already made it clear in earlier postings that upstream tweaks related to Rebalance/clock/generate won't do anything for the iDSD Pro as those concepts are built from the grounds up into the iDSD Pro. So the only thing that it doesn't solve is ground related noise which iDefender seems to take care of.
     
  10. flyte3333
    Pro iDSD's USB input isolates the USB ground.. that's part of what USB galvanic isolation involves...

    The report of pops MAY (or not) mean this is something different to you what you're talk about...
     
    Last edited: Jan 17, 2019
  11. lichie
    Yeah, I was already aware that I had this ground noise problem. It has caused me problems with some dacs in the past (especially schiit dacs). I already owned the iDefender because of this. What was strange with the iDSD was the way the problem manifested. With some other DAC (like the schiit dacs) I can immediately tell there is a problem because I can hear the ground noise hum through the dac at all times, even with no music playing. But with the iDSD there was no sign of any noise or any problems until you started playing music (and only 44khz/48khz files). And even then there was no noise (even with the output level low), but just small pops every now and then.

    Again, I don't really consider it a flaw with the DAC, but it definitely made it hard to figure out the problem.
     
    Last edited: Jan 18, 2019
  12. iFi audio

    The iDSD Pro can be effected by packet errors the same way any USB device can. However, it is not affected by:
    • noise on the USB power (it does not use USB power)
    • ground/earth loops via USB or other inputs (because it uses galvanic isolation)
     
    iFi audio Stay updated on iFi audio at their sponsor page on Head-Fi.
     
    https://www.facebook.com/iFiAudio/ https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ info@ifi-audio.com
    flyte3333 likes this.
  13. iFi audio
    Also, we have just released a short but sweet guide about MQA via SPDIF on Pro iDSD in Tidal. Enjoy!

     
    iFi audio Stay updated on iFi audio at their sponsor page on Head-Fi.
     
    https://www.facebook.com/iFiAudio/ https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ info@ifi-audio.com
  14. peterjgross
    If the popping issue the customer reported is a symptom for packet errors caused by noise at the source computer is there an explanation why this occurs only at 44/48kHz, but not at files with higher sampling rates?
     
  15. gordec
    Have you tried running Pro iDSD straight out of USB port? Does it still pop? At least this would help narrow down the problem.
     
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