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opus101

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About opus101

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  1. It wasn't intended to imply malicious intent - but he did bring Schiit's design competence into doubt through what appears to be a misunderstanding of the DS. In saying not 'from this' it was shorthand for 'not from the measurements I drew attention to' seeing as the context (established by yourself and the title of the thread) was firmly measurements.
  2. I'm not sure if belief is relevant here, he's stated openly that he has a mission.
  3. Ah that's not 'from this' - seems he brought that to the discussion prior.
  4. I missed the place where @Audiophile Neuroscience got information about Amir from this.
  5. The key insight is that the AD5547 is a multiplying DAC and this FFT shows it operating in that mode - with its reference voltage being fed a sinewave. So the digital input is being held constant, unlike in the FFT on the right.
  6. This post is indeed a prime example of misleading measurements. You need to go to the AD5547 datasheet to see why though, the small print gives away that the two FFTs Amir places side by side are not comparable. https://www.audio “science” review/forum/index.php?threads/review-battle-of-schiit-audio-dacs.5487/post-121858 Seems someone doesn't want a link pointing to ASR, you need to get rid of those quote marks, close up the spaces and add .com before it becomes valid.
  7. Not completely sure its relevant here but Amir misappropriated ADI's measurements of their DAC chip to malign Schiit. If you need a link I'll look it up.
  8. As far as I recall, Amir is clueless about common-mode noise. I did try to educate him once when he was still active on WBF but he proved singularly resistant.
  9. From my reading of Mola Mola's technical blurb, it isn't DSD. Its PWM quantized at 100MHz.
  10. There's more to a DAC than solder and silicon. They normally have electrolytic capacitors for example.
  11. MLP recordings to me sound in general too bright, the tonal balance sounds 'tipped up'. How might this happen? Or is it just my ears which aren't correct? I don't hear this with the very few Telarc recordings I have though.
  12. 4VRMS is a lot for 80ohm HPs in terms of SPL but only a couple of hundred mW so not likely to damage them. The 1/8th impedance rule is just a rule of thumb for indicating the highest source impedance which is likely to work well. Your specs don't say what the output impedance is so I can't tell if its violated or not.
  13. Your 80ohm HPs will do just fine driven by this device as the range is 8 to 600 ohms. They'll also play extremely loud if fed by 4VRMS so I'd be more concerned about ear damage than HP damage. HPs are most at risk from being accidentally driven with DC - you may want to check if your HP amp has DC protection built in.
  14. Often mistaken but never in doubt
  15. Are you sure its up to the engineers? When I had that job I couldn't just design purely from an engineering point of view I had to make sure I included all the aspects that marketing said were important....
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