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  1. Arpiben

    Toslink weirdness???

    Well return your Blue Jeans fibers. Why did you purchase/try them?
  2. Arpiben

    Toslink weirdness???

    Clear, thanks. i was asking because: touching with metal/fingers/plastic has no incidence at all in the optical unless Blue Jean optical has its metallic connector touching your Denon screw or some metallic case..... passive optical switches are adding additional attenuation to the optical...
  3. Arpiben

    Toslink weirdness???

    Hi @Sebastian.Athea , You are perfectly right, watching your video I got the wrong idea that you were dealing with an SPDIF cable instead of a fiber (Toslink). My misunderstanding, sorry. Then return your Blue Jean optical fiber. Is the picture dealing with your DAC? Can you tell us more about...
  4. Arpiben

    Testing audiophile claims and myths

    Time to change your recordings methods then :). Use ultrasonic mics at eye & skull level rather than record them at ears (binaural).
  5. Arpiben

    Possible source of "digital harshness"

    More details in this not so recent thread: https://www.head-fi.org/threads/ripping-cds-that-have-pre-emphasis.423506/ Some updates are probably needed regarding ripping software but still instructive.
  6. Arpiben

    Testing audiophile claims and myths

    Even at small Jazz club my ears are rarely less than 5 meters from cymbals and almost never in free line of sight (no obstacles). A few posts back I did provide @KeithEmo with closed mic ed cymbals hits. At that time I was requesting how he could retrieve room characteristics from its ultrasonic...
  7. Arpiben

    Testing audiophile claims and myths

    Not exactly 20log(2/0.5) + AIr Absorption at 200 Hz ( neglectable) -> roughly 12dB vs 14dB. ( 200 Hz has a 1.5 meter wavelength, in principle the 1/r attenuation is not applicable interactions between waves are more complex. I did the above calculation just for copping with your example )
  8. Arpiben

    Testing audiophile claims and myths

    Ultrasonics do follow same law as any other frequency provided that they are in Far Field (greater than two wavelength distance). Atmospheric Absorption is frequency dependent. ISO 9613 calculator provided is dealing only with such absorption. https://www.mne.psu.edu/lamancusa/me458/10_osp.pdf
  9. Arpiben

    Testing audiophile claims and myths

    2 meters: ~14 dB attenuation for f=30 kHz @2m/0.5m with 50% humidity in free space.
  10. Arpiben

    Testing audiophile claims and myths

    No Keith. You have distance! - 20 log r in Free space or Fresnel zone. It is the case for f=30 kHz at 6 feet.
  11. Arpiben

    Testing audiophile claims and myths

    The 50 dB attenuation for f=30 kHz @20m/0.5m with 50% humidity in free space is indeed very correct. :)
  12. Arpiben

    Why do USB cables make such a difference?

    Do you mind sharing the DAC Output effects of an item not coping with your standards? Just the output, no item name or any EMC levels. Thanks.
  13. Arpiben

    Testing audiophile claims and myths

    Hoping you will have a limit and not ask for ultrasonics up to hundreds of kHz in order to check musicians and public organs/pregnancy/ etc...:)
  14. Arpiben

    Testing audiophile claims and myths

    Why do you need ultrasonics for reverb when you should have enough of such cues in the audio bandwidth? Gravity analysis is using wavelets transforms since they offer a faster convergence/decay vs Fourier.
  15. Arpiben

    What kind of Ultrasonic Frequencies are in HD Tracks?

    How much are you estimating that ultrasonic gain? What about the effects of ultrasonic huge amount of energy produced by noise shaping then? Depending on how ears filter the added ultrasonic energy should be insignificant.
  16. Arpiben

    Watts Up...?

    A complementary information about Fourier uncertainty. The information available from Fourier analysis is bound by an uncertainty relation called the Gabor limit. This says that you cannot know the timing of a sound and its frequency – or pitch – beyond a certain degree of accuracy. The more...
  17. Arpiben

    Watts Up...?

    In order to perfectly reconstruct a bandwidth-limited sampled signal there is no other option than applying a sinus cardinal (sinc) convolution in time domain. Applying a sinc in time domain is equivalent to apply a perfect Low Pass Filter in frequency domain. Cf. Nyquist, Shannon, Whittaker...
  18. Arpiben

    Watts Up...?

    Unfortunately all this industry 'pseudoscience nonsense' is not limited to sampling or filtering:clocks,jitter,cables,digital data transmission,etc. The list is too long.
  19. Arpiben

    Tight 16 vs. Sloppy 24 bit

    Music technology/science is indeed truly multidisciplinary (some would say transdisciplinary). It incorporates aspects of the traditional disciplines of music, engineering, physics, psychology and computer science and, of course these disciplines themselves incorporate others such as...
  20. Arpiben

    Tight 16 vs. Sloppy 24 bit

    @castleofargh Pardon. We wrote at same time and your post arrived before. Slts.
  21. Arpiben

    Tight 16 vs. Sloppy 24 bit

    @Avatar86 You may have confused bit depth (16 bits / 24 bits / 32 bits) with sample rate or sampling frequency ( 44.1kSps/kHz,48 kSps/kHz,88.2 kSps/kHz, 96 kSps/kHz,etc...) kSps means kilo Samples per second. It is the unity for sampling rate. Sampling rate may be expressed also as a sampling...
  22. Arpiben

    Cables.

    In Telecom industry same rule as above is applied when dealing with BNC , coaxial, RJ45 cables as well as fibers. The choice is driven by utilisation. Manufacturers do provide the relevant caracteristics.
  23. Arpiben

    Rob watts DAC design talk

    Digital signal processing progress those last decades make me wonder why some still use 'infinite' or better say very long time sinc interpolation (million taps) when more efficient methods or transforms are available.Wavelets is only an example among others. The last video,is probably more...
  24. Arpiben

    Rob watts DAC design talk

    Hopefully Gravitational Waves (perturbations of space time metric) are not measured with @tansand's methods. Gravitational Waves are chirps or frequency modulated signals. A chirp with small duration is a transient signal. Chirps are found in nature: birds (song),bats/dolphins/whales ( language...
  25. Arpiben

    What kind of Ultrasonic Frequencies are in HD Tracks?

    Poor dog! Digitally Low Pass filter and sure she will not move next time unless she doesn`t really like fusion.
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