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About Music2496

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  1. NAD M51 measurements: https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-nad-m51-dac-and-digital-preamp.6681/ "Alas, that fell apart when we look at distortion and noise at levels below max. There is a sharp increase in distortion, costing us some 30 dB or so in performance." Chord Qutest measurements: https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-chord-qutest-dac.5981/ "From pure performance point of view, the CHORD Qutest nails all the tests I threw at it, garnering the top spot in DACs I have tested."
  2. For sure. The same Rob Watts says of course. So it goes back again to the Jussi Laako quote which captures things nicely I find... No surprise given Jussi's expert understanding of the topic overall and he doesn't have a bias towards any particular direction whether slow or fast roll-off, short or long filter, linear or minimum phase, etc... there are always trade-offs that need to be made as Charlie Hansen (another expert on the topic) says above.. I've linked it earlier in this thread. If I can find it later I'll re-link it. I had those screenshots saved because I shared those earlier in the thread too.
  3. Here are a couple of screenshots from the very famous Ayre Acoustics (the late Charles Hansen) whitepaper.... Note the 'no free lunch' Charlie refers to in this whitepaper... this is very much along the lines of the compromise discussed earlier... and what Jussi Laako refers to in the quote I shared... And note again, when you read the entire whitepaper and the direction Ayre choose to go, this is based on how they weight the different compromises involved... Rob Watts is at the other extreme in his choice/s of compromises... and there are other DAC designers that choose in between these extremes...
  4. A linear phase filter doesn't have to be infinitely long... so I'm not sure just merging a couple of selective lines about sinc filter and linear phase response, answers my question... A Dirac delta response is not ideal (in maths)?
  5. You've merged two separate things there.... sinc filter and linear phase response... I'm not asking where is the maths to show if linear phase can give the ideal time domain response... I'm asking only about the sinc filter... For ideal time domain response, there is the Dirac response in maths...
  6. JA isn't a DAC designer so you can ignore my mention of JA (which was only for illustrative purposes)... Bob Stuart, Charles Hansen, John Westlake are well regarded DAC designers that agree that Figure 4 I showed above is closest to the ideal time domain response...
  7. Except where is the maths to show it is perfect in time domain? I referred to Dirac and you referred to Rob Watts marketing.. That was just an aside by me... not relevant to my original question about where is the maths to show an ideal sinc function gives the ideal time domain response...
  8. Thanks, you pointed to accepted maths (ideal sinc function) which is great for the frequency domain explanation and I was hoping you could point to maths again for the time domain explanation, instead of Rob marketing material. We've had this discussion before, that Meridian Audio, Ayre Acoustics (Charles Hansen), John Westlake and some other well known DAC designers would agree with what JA of Stereophile says below that Figure 4 has the optimal transient response. Closest to the ideal Dirac delta function? So then we get into the discussion of the compromises between getting ideal frequency domain response and ideal time domain response and we get back to Jussi Laako's (HQPlayer developer) comment which probably sums it up best overall (in my opinion): "looked from two extremes, both Chord talking about transient accuracy with extremely long filters and MQA talking about transient accuracy with extremely short filters are both right in a way, but only looking at things from one point of view while ignoring others. As usual in life, truth is somewhere between the extremes..." https://audiophilestyle.com/forums/topic/49609-john-atkinson-yes-mqa-is-elegant/?do=findComment&comment=866897 My own personal thoughts (from my bum here, from personal experience, not expertise) from seeing the popularity of the extremely long linear phase filters in the HQPlayer world (where people have all the options between extremes) is that people seem to be more sensitive to the frequency domain... maybe the time domain performance of these long linear phase filters is already 'good enough' for the ear/brain system... whereas when you get closer to the ideal transient response (Dirac?) people seem to be more sensitive to the earlier frequency response roll-off needed to get closer to the ideal transient response (ideal in maths...) and subjectively don't like this earlier roll-off in the frequency domain. Maybe the same applies with Rob's WTA filter (which is extremely long and linear phase). But then again, there are a lot of really happy people with their Charles Hansen, Bob Stuart, John Westlake and others' designed DACs...
  9. Nice. Can you explain how it is “more correct” in time domain? Frequency domain, I agree, of course.
  10. “More correct” in which domain? Frequency domain? Time domain? Both?
  11. In your case you heard no difference which is a great problem to have but actually no, objectively it is possible to make a difference (but different doesn't always mean technically better..). AC filtering has the potential to increase AC leakage currents between PSU's, by increasing impedance between outlets...depending on the design of the powerstrip/board. Some expensive power conditioning boards have filtering between each AC outlet... I don't know about this Isotek being discussed though. This big thread below talks about the potential mechanisms. It's probably easier to just filter (hehe) for John Swenson's posts, rather than read every post. The thread title has isolation transformers in it but the discussion goes into AC powerstrips and filtering... https://audiophilestyle.com/forums/topic/29662-discussion-of-ac-mains-isolation-transformers/
  12. Yep I've had issues with Tidal too. You guys should report this to support@tidal.com so they can look into if this is a regional issue (or not).
  13. Regarding digital room EQ (not speaker correction), had you tried just limiting this DSP to schroeder frequency (i.e. under 200/300/500/whatever Hz) and you didn't like resulting SQ? Or you had tried this and happier with full range DSP? Does your DSP box allow limiting DSP to custom range?
  14. Regarding digital room EQ (not speaker correction), had you tried just limiting this DSP to schroeder frequency (i.e. under 200/300/500/whatever Hz) and you didn't like resulting SQ? Does your DSP box allow limiting DSP to custom range?
  15. Are you applying digital room EQ (with measurements at listening position) all the way up to 20kHz?
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