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About psjug

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  1. This could be exactly what is needed to add a few thousand more pages to the thread.
  2. This seems to make sense, but the attenuation factor does not consider room reflections so results in an overestimate of required power. I really don't know the peak SPL I would want in short bursts. Is 103dB more appropriate? Or should I allow for more than 106dB for the occasional short duration peaks in very dynamic music? Obviously this makes a huge difference in your calculation. I think it is really hard to know unless you try the equipment in your room, and that's where a clipping indicator would be helpful.
  3. In that case, thank you very much for your support! Ha ha. I am still trying to wrap my head around the peak power numbers shown in the video, since it seemed that they were not playing at very high volume. I guess the room is pretty large, though.
  4. Don't know if you bothered to watch the video in the OP, but if you had then you would know that I was making the case that many hundreds of watts are not required, at least in my case. Of course average power at normal listening is very low, and also does not say much about what peak power you need. Care to offer anything on that?
  5. I don't know... I looked on a scope playing that track into 8-ohm, 87dB speakers. I turned it up about as loud as I could stand it and peaks were only about 25V. I think 100 watts is good enough for me. I do wish I had clipping indicator though.
  6. I am pretty sure that @mansr found that they typically use 15 bits, so on the one hand that's better than 13 bits, but on the other hand there is nothing left for ultrasonics. However they are doing it, MQA-CD is a bunch of nonsense.
  7. In general, I'm not sure I have a different POV from you or not. But regarding the meta study:, do you find it compelling?
  8. In the analysis I see the small, not the meaningful.
  9. Ignoring the possible flaws in that analysis (and flaws of the studies drawn upon), do you really find the conclusion very compelling? Overall, there was a small but statistically significant ability to discriminate between standard quality audio (44.1 or 48 kHz, 16 bit) and high resolution audio (beyond standard quality).
  10. Just a guess, but maybe Deezer just signed on so they could be ready in case MQA proved popular. And since it hasn't caught on, Deezer is not bothering with MQA.
  11. That is an interesting amplifier (I read the google translated http://www.webalice.it/mauro.penasa/Relazione_MY_REF.html). Do you know if there is a bridged version?
  12. And Deezer too, at least for now.
  13. So horrible-sounding Sirius has acquired Pandora (currently 192kbps for premium service). And MQA is hoping to hitch themselves to this. Sounds like we can expect another dumbed down version of MQA, something with worse than MQA-CD quality.
  14. Is this the 0.0006% figure for the op amp? The distortion I was talking about would be from the residual of the filtered power amplifier's waveform (audible frequencies), which is part of what is sent back to the amp for the purpose of offset correction. In the original circuit (bottom image), I think this has a 90 degree phase shift in the audible band, which can't be good. In the updated (top) circuit, the two pole input filter gives a 180 degree phase shift, so I would guess this and also the much greater attenuation by the input filter would give a very good improvement, much more than the lowering of the noise. Correct me if my thinking is wrong; I am not very experienced in audio circuit design.
  15. So to get back to whether you are hearing the improvement because of lower noise or something else... Don't you think that greater attenuation in the audible band in the revised circuit should result in lower overall distortion from the power amplifier? And so maybe this is the improvement you are hearing, not the lower noise?
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