Shadders

Wammer
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Shadders last won the day on March 21 2019

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About Shadders

  • Rank
    Experienced Wammer

Wigwam Info

  • Turn Table
    N/A
  • Tone Arm & Cartridge
    N/A
  • SUT / Phono Stage
    N/A
  • Digital Source 1
    Dune HD Base 3D
  • DAC
    Audiolab 8200AP
  • Integrated Amp
    CambAudio Azur 650
  • My Speakers
    DIY Transmission Lin
  • Trade Status
    I am not in the Hi-Fi trade

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  1. Hi, It is still a belief. You have not proven : That the floating point output is different to a fixed point output, in the 24bit integer data stream That the DSP processing (algorithm) is exactly the same for both DSP cores (floating, fixed). That there is no other process occurring in the floating point DSP compared to the fixed point DSP, or vice versa. That the DAC IC used in the fixed point system is different, or if the same and has been setup different, between the fixed and floating point system. That the floating point system may have better implementation of the power supplies, components etc compared to the fixed point system. As per your previous post about the 8c which i did in error, fail to see the double negative - what evidence do you have that a system has been implemented badly without seeing the DSP code, and schematic diagrams with bill of materials list, to confirm that the design has been poorly implemented ? Regards, Shadders.
  2. Hi, Yes - and my response to this was, where are the reports ?. Many people have digital volume controls (digital domain) and digitally controlled analogue IC volume controls in their equipment, and no one is aware of the distortion of the analogue IC volume controls which exceed amplifier THD. I did create a post a year or so ago about it, but no one responds. It truly is, out of sight (knowledge), out of mind. Again, is the data stream of 24bits to the DAC any different from a floating point or fixed point process ? Regards, Shadders.
  3. Hi, This is what i was referring to - i do not see any reports of DAC units degrading the sound at low listening levels. If there are no reports or complaints, then it is not an issue. You have referred to 32bit floating (point) DSP platform... Do you have any evidence that a 32bit fixed point DSP platform has a different result than the floating point implementation ? That is, is the 24bit bit stream sent to the DAC any different from a fixed point DSP to a floating point DSP processed signal (in regards to volume control) ? Whatever happens, then the final data stream to the DAC is still 24bit integer (akin to "fixed point"). Is it possible that you have allowed your belief that floating point is "better" than fixed point, and have therefore come to the conclusion you have ? Regards, Shadders.
  4. Hi, Not sure what the issue is. Does anyone have evidence that the 8C (i assume we are talking about this) has been implemented badly ? I have made no such claim. I have asked (question mark at the end of the sentence) whether there are discussions on the DAC IC implemented volume control, for DAC units that do not include a DSP. I do not see such conversations - hence the question mark - are there any ? If there aren't such conversations occurring regularly - then is it an issue ?., or just a problem in peoples heads ? Regards, Shadders.
  5. Hi, I think you would need to know how the manufacturer has implemented their system on the DSP board of the speakers. I would implement the volume control within the DSP. It may be worth thinking about every other manufacturer that has implemented a volume control and that no one has every reported that at low volume levels, that the "sound" is worse. (Most of the DAC IC's have volume controls within them, where the DAC does not use a DSP, then it will be using the onboard DAC IC volume control.) If there have not been any reports of people using the volume controls on a DAC unit degrading the sound, then it is not an issue. Only when people start to analyse a product, do they then "hear" problems ? Regards, Shadders.
  6. Hi, Yes and no - it depends on the application in hand. The ADAU1452 has 32bit processing. See the following post : https://ez.analog.com/dsp/sigmadsp/f/q-a/67084/adau1446-dither States : "Yes, truncation can lead to audible artifacts, but in this case, no truncation is actually occuring. The DSP outputs a full 24-bit signal and the serial ports output a full 24 bits as well. Dither is useful in situations where you are lowering the bit rate of a signal by truncating the LSBs. For example, if you connected our 24-bit DSP to a 16-bit audio DAC, then the DAC's serial input port would truncate the lower 8 bits, effectively reducing the dynamic range of the signal from 144 dB to 96 dB. In this case, artifacts resulting from truncation could certainly be louder than the noise floor of the DAC and could be audible to the listener. However, if you output from the DSP directly to a 24-bit DAC (see our list of 24-bit audio codecs for examples), there is no truncation necessary. The full 24 bits are output from the DSP directly to the DAC input, so your dynamic range of 144 dB is preserved. Our evaluation board, for example, features a full 24-bit path from AD1938 to ADAU1442 to AD1938." The only problem i can foresee is when you implement a volume control and you begin to lose bits through this process. Regards, Shadders.
  7. Hi, Yes - you would have to implement the relevant digital filter to remove the higher than 24kHz content before the downsample process. Regards, Shadders.
  8. Hi, The downsampling is in regards to the sample rate only. The lower rate allows for more processing (executable instructions) of the signal. Regards, Shadders.
  9. Hi, Not sure which speaker you are referring to, but someone posted that the D&D 8c implements an Analog Device ADAU1452 DSP IC. From the datasheet : The SigmaDSP core features full 32-bit processing (that is, 64-bit processing in double precision mode) with an 80-bit arithmetic logic unit (ALU). The 32bit noise floor should be sufficient for any equalisation. Regards, Shadders.
  10. Hi, Yes, the person resurrecting this thread has only one post, and mentions MQA at the end of their posting. This is nothing to do with Apple purchasing Tidal - as we now know that they haven't. Regards, Shadders.
  11. Hi, Congratulations and good luck on the upcoming nuptials. Regards, Shadders.
  12. Foo, Foo, Barney McGrew, Cuthbert, Dibble, and Grub.
  13. Hi, Yes - there have been too many wheezes by the hifi industry leading us to believe all sorts of things. We have local feedback is better than global feedback, and less is good. We have, too much global feedback is bad. We now have, even more feedback is good. All along the way, the subjective theories promulgate into the audiophile world, and they are believed. Will the "even more feedback is better" be used in class A/B amplifiers in the future, as it will become audio folklore ? Regards, Shadders.
  14. Hi, Excellent reference to the past. The last statement in the document is quite apt : "Even in the wiring of electric-bell circuits, the use of Litz wire is claimed to give "tintinabular superiority". How silly can we get? All this sort of thing, which seems to be encouraged by some of the hi-fi magazines, for whom it no doubt provides easy material for filling their pages, is surely not good for the future of the audio industry, being liable to bring it to a state of disrepute with intelligent people." Sadly, that sort of thing was good for the hifi industry, as it made a lot of people a lot of money from the OCD of the believers. No offence to those impacted. Regards, Shadders.
  15. Hi, Bruno Putzey wrote an article for Linear Audio, reprinted online : https://www.edn.com/design/consumer/4418798/Negative-feedback-in-audio-amplifiers--Why-there-is-no-such-thing-as-too-much This is contrary to the usual audiophile approach, where negative feedback is seen as detrimental. Regards, Shadders.