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About pkane2001

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  1. Right. Phase differences result in ITD or differences in time of arrival between the two channels. This is more destructive to soundstage at lower frequencies, below around 1.5kHz.
  2. As discussed, it is not THD but interchannel differences that determine soundstage “quality”. These are caused by differing levels and amounts/types of distortion between channels.
  3. You did ask for a way to determine if: "soundstage was measured to be excellent, width was x, depth was y and height an exceptional 97.4". I assume X and Y would have to be in some units of length, so why not inches? Do you have something against inches? Anyway, I agree, let's stop here.
  4. Answer was already given for what determines the accuracy of soundstage reproduction. If you want something different, like soundstage dimensions in inches, you'll have to ask someone else, as that was never something I wanted to know. The math exists, you'll just have to do some homework.
  5. I'm not sure I can explain it any better, but I'll try one more time. If I know how to place any instrument in a multi-track recording at a specific sound stage position (I do, and so do all the mastering engineers), and this is done using these three variables, then we know the correlation between these three variables and soundstage position, and therefore, size. Whether I personally measure "soundstage size" or not is irrelevant, and I'm not interested in such a measurement. But nevertheless, correlation exists, and it's a mathematical function performed by most DAWs and plugins that generate stereo position from these three variables. If you claim that there's no correlation between these three measurements and soundstage, then everybody has been doing it wrong all this time.
  6. I'm pretty sure that this differs person to person. You can try some of the easy to configure cross-feed plugins with headphones to get a sense of what is audible to you. Phase and crosstalk are two things I want to add to DISTORT app when I get some free time. I'm pretty sensitive to crosstalk, and cross-feed never sounded right to me, so I don't use it.
  7. Again, why? I don't measure DACs to determine the exact size of the soundstage they'll create. I measure them to determine if the soundstage in the recording will not be disturbed. For that, I use the variables I already listed.
  8. It's not done by Amir, but that doesn't mean it doesn't exist and cannot be measured. That was the claim made by AN.
  9. Amir usually measures channel imbalance and crosstalk. Don't think he's measured phase differences before, but I could be wrong. DeltaWave allows for direct computation of phase differences between two related waveforms, including music or test tones. It computes some RMS phase difference numbers by frequency range, but also plots the phase difference, as well as corrects for it. Below is one example with an analog capture compared to digital, but you could just as easily compare left to right channel in an analog capture, say at the output of a DAC (blue line is the original, uncorrected phase difference, red is after DW corrected it):
  10. Differences between time of arrival and amplitude between the two channels will cause a change to soundstage, as will crosstalk.
  11. A DAC doesn't have soundstage height, width and depth.
  12. Crosstalk is easy. Level imbalance is easy. Phase differences using DeltaWave, but other tools that show phase will do this, like REW.
  13. Distortions between channels: crosstalk, level imbalance/nonlinearity, phase.
  14. Here you go: As I said, in most recordings soundstage is artificially generated, instruments and voices placed at desired positions using level, phase, and reverb. The soundstage you hear is defined by those parameters. Perfectly.
  15. So you want to measure the exact size of the soundstage in inches... why? I thought we are talking about equipment and not recordings. A DAC doesn't have a soundstage. A recording might. Measuring a recording is a completely different task than measuring a DAC, and while that can also be done, that's of less interest to most (although I've built software to do just that, anyway). Measuring how a DAC affects a recording is exactly what measurements do, including if soundstage will be affected. And that's what correlates with perception and preferences. Don't know why this is so difficult to understand.
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