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

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  1. ItsAllInMyHead
    Installed on iDAC 2 and iDSD Micro BL. The verdict is still out. I've never been able to make heads or tails from the filters. I've just used bit perfect. Now I have it switched to GTO to give it a go.

    Seems the light is always yellow regardless of depth/rate on the BL DSD is still blue, but all PCM seems to be yellow. I've never looked at the lights, but...
     
  2. iFi audio
    Please shoot us a message via our support platform, we'll send you previous FW.
     
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  3. iFi audio
    An impulse is used as a "diagnostic" signal to illustrate the behavior of a filter. Please await the remaining parts for further light to be shed on what is happening with digital filters.

    And yes, "bandwidth limited signals (ie. music)" do ring in precisely the same way, in this case precisely because of the filter's structure.

    Another way of looking at "ringing in filters" is to consider the impulse response a combination of pre-echo (where present) and post-echo plus the actually intended signal.

    The pre- & post-echo do not only apply to impulses, but to any signal passed through this filter.
     
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  4. iFi audio
    This is correct. The GTO filter is implemented in the XMOS CPU, thus all incoming PCM audio (except MQA) is upampled to 8x PCM via this filter. MQA retains its own processing while DSD operates as previously.
     
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    ItsAllInMyHead likes this.
  5. avischiller
    Were can I get an ESL cable to pair up Pro iESL can anyany help
     
  6. iFi audio
    ESL cable? Can you clarifiy? Do you mean that HDMI based shorty to match Pro iESL with Pro iCAN?
     
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  7. avischiller
    Yes exactly that's what I mean.
    Thanks.
     
  8. iFi audio
    iFi audio - The GTO filter
    Part 3/4 - Introducing the iFi GTO™ Digital Filter

    HOW TAPS RELATES TO WHAT IS HEARD

    So far, we have identified that we prefer the GTO filter because it has few taps.
    Because:

    More taps = more reverberation.
    Few taps = minimal reverberation

    Reverberation is artificial. Sound engineers add reverb to make recordings more spacious, artificially so. Digital filters introduce reverb by the nature of their operation. In fact, a digital reverb unit operates precisely like a digital filter in principle – as depicted in this diagram.

    1.png

    Within digital filters are Digital Delay Lines which is defined by Wikipedia:

    "A digital delay line is a discrete element in digital filter theory, which allows a signal to be delayed by a number of samples.
    Delays of N samples is notated as {z} ^{-N} motivated by the role the z-transform plays in describing digital filter structures.
    Digital delay lines are widely used building blocks in methods to simulate room acoustics, musical instruments and digital audio effects."

    To our ears, the GTO filter simply sounds ‘right’ without any hint of artefacts or exceptional detail that feels ‘processed’, by avoiding large number of tap’s that add excessive reverb.

    TRANSIENTS AND THE HUMAN HEARING

    The human ear is a marvelous system with an incredible dynamic range (~135dB in middle frequencies) huge bandwidth (almost 1:1000) and a transient resolving ability that exceeds the upper limit of hearing steady state tones. Yet it is also subject to limiting factors which result in, so to speak, “blind spots” in its behavior that do not exist in purely mechanical systems (e.g. microphone). These “blind spots” can mask some behavior which objectively is distortion to be inaudible. For example, harmonic distortion masking has been well documented since the at least the 1950s if not earlier and it is reasonable to consider that ‘ringing’ on transients is also masked to a certain degree.

    2.jpg

    If we wish to produce audio gear that is capable of operating in a way that subjectively sounds undistorted to the human hearing (the most logical preference), we must understand its limitations and capabilities. Here, we focus on the time-domain capabilities.

    It has been shown that the human hearing’s time domain resolution for the initial transient may be as small as 5μs. Some debate remains as to the exact limits, though work done by Dr Peter Lennox of Derby University suggests a median between 13…18μs, or a location accuracy of less than 2 degrees.

    Additionally, the transient response of the human hearing includes 500...700uS ringing caused by the ear’s mechanical system (Tympanic Membrane, Malleus / Incus / Stapes).

    3.png

    This ringing occurs after a transient event, there is no pre-ringing. The ringing in the ear’s system will mask any similar external ringing, which will instead be integrated into the transient, so it is inaudible.

    Any pre-ringing is not masked by the human hearing, nor is any ringing that continues substantially beyond 500...700uS.
     
    Last edited: Sep 25, 2018
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  9. iFi audio
    Oops, double.
     
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  10. avischiller
    Will a short HDMI cable work to connect the iESL to the Pro iCAN
     
  11. Currawong Contributor
    I don't want to drag this into a massive argument, as it has been demolished in discussion on Computer Audiophile in the MQA threads, but, say, a 1 kHz tone, or even single impulse at that, or other music frequency, will not have ringing if there are no out-of-bandwidth frequencies (where then, it would not be a 1kHz tone), unless, as I understand it, the filter is poor.

    You'll be glad to know that I don't feel I hear any reverb with your 16k Transient Aligned filter. I imagine a badly implemented high-tap filter might have reverb, but it's the first I've heard of it.
     
    Last edited: Sep 17, 2018
  12. Em2016
    Respectfully - didn’t you say you preferred the GTO filter? Accidentally mistaking it was 16k taps when you actually preferred the 32 tap GTO filter?

    A nice blind test ? :wink:

    https://www.computeraudiophile.com/...sd-dacstreamer/?do=findComment&comment=832568
     
    Last edited: Sep 17, 2018
  13. avischiller
    You didn't answer my question what type of HDMI cable will I need to do that please get back to me
    Thanks.
     
  14. avischiller
    You didn't get back to me what type of HDMI cable will I need to power this
    Thanks.
     
  15. ItsAllInMyHead
    Thank you for the clear explanation.

    I know it is extremely challenging for iFi to speak to software implementations, but I have searched far and wide for an answer to what I hope is a simple question using a popular software player. I hope the answer will benefit a great number of people that are interested in "filters". I admit that the more I read about filters, the more confused I get.

    For my laptop / PC implementations I use Audirvana+ as a player. Within that software, there are filter options. I am not asking you to comment on Audirvana+ specifically or their options for filter implementations, but I could use some assistance. I also realize this is the Pro thread, so although I don't own the Pro yet, I'll include the Pro below.

    With the Nano iDSD BL, the Micro iDAC2, the Micro iDSD BL, and the iDSD Pro - Using 5.3C (or equivalent) firmware I would like to:

    1) Make sure that Audirvana is not doing any "filtering" - i.e. let the DAC do the work.
    2) Make sure that filters aren't "stacking" (if that's even a possibility). If I have a filter active in Audirvana+ (iZotope or SoX) I want to use no filter on the DAC.

    Could @iFi or anyone knowledgeable with the software / hardware please help out or point me to a source. I've searched Head-Fi, Computer Audiophile, and the Audirvana forums.

    tl;dr - Please help help a noob that wants to be certain that I'm hearing what's intended with the iFi filter implementations and ensure I'm not muddying up the works.
     
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