- Thread Starter
- #41
Good find. I will run the traditional sweep at 44.1 and report back.
Here is an interesting data point. I looked up the measurements of the Analog Devices AD5547 which Schiit Multibit uses: https://www.analog.com/media/en/technical-documentation/data-sheets/AD5547_5557.pdf
There, they show an FFT of THD similar to mine. Here is how their measurements compare to actual implementation in Schiit Multibit:
View attachment 18302
Notice the far, far better performance Analog Devices is showing in their measurements versus Modi Multibit. Their worst case distortion is around -110 dB or 25 dB better than Modi Multibit! That massive second harmonic peak seen in Modi Multibit is simply not there in Analog Device's measurements of the same chip in their bench implementation.
So we are really back to what I said in the review: people seem to sweep clear engineering problems away. They don't verify their designs properly and leave clearly engineering mistakes in there. Done correctly, the AD5547 would have been much closer to classic Delta-Sigma implementations. Until recently, Schiit did not take this seriously. They needed to have.
No, it is fancier than that. Here is the parameters:Is your multi-tone test basically spacing the tones at 1/3 octave intervals?
I didn't realize that iFi made anything that was Multibit...@amirm if I recall correctly you have two more multibit devices that probably measure much better than this one right? your Mark Levinson and the iFi iDac2 (hybrid). maybe another possible DAC-off?
They use a weird DSD1793 chip for basically all of their products. Its output is very niche since its part multibit part delta sigma summed up. You can read a little about it in this thread. So not "multi-bit" in the true-est sense of the word.I didn't realize that iFi made anything that was Multibit...
That chip is actually very similar to the PCM1792A, its not any more multibit than other modern Delta-Sigma converters like the ES9028.They use a weird DSD1793 chip for basically all of their products. Its output is very niche since its part multibit part delta sigma summed up. You can read a little about it in this thread. So not "multi-bit" in the true-est sense of the word.
The iDAC amir owns is probably more or less the same as the black label ones, but iFi themselves claim it's their best DAC besides their 'Pro' dac so I do wonder...
Yes well Burr Brown's own specs claim that the first 6 bits go through an R2R-ladder. Real implementation details are missing though so this is mostly just "secret sauce" claims. You could be right.That chip is actually very similar to the PCM1792A, its not any more multibit than other modern Delta-Sigma converters like the ES9028.
They are all using "multiple 1 bit DAC's" and summing the outputs internally or balancing them to reduce distortion.
Nothing HRH Audio King Amir does is ‘basic’ , you blaspheme Dennis!Is your multi-tone test basically spacing the tones at 1/3 octave intervals?
Is your multi-tone test basically spacing the tones at 1/3 octave intervals?
Nothing HRH Audio King Amir does is ‘basic’ , you blaspheme Dennis!
If I were ever in prison I’d want to share a cell with Dennis, he scrubs up good.So true. But then again, Dennis does have absolutely the most adorable avatar here.