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Schiit Yggdrasil -- 21 bit?

Schiit says that Yggdrasil is a 21 bit DAC. But the DAC chips that they put in the device ( Analog Devices AD5791BRUZ, 2 per channel) are 20 bit with the error of plus-minus 0.5 LSB.

How can the DAC be 21 bit if the chips are 20 bit? Using two chips per channel does reduce the RMS voltage of the noise by  a square root of 2. But how can you get to 21 bit from there?

Can someone please explain.
defiantboomerang
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defiantboomerang OP
141 posts
 
@davide256 

Plenty of people here disregarding measurements. One could almost mistake this for Absolute Sound. Whatever happened to understanding science and engineering instead of relying on subjective assessments of "sound quality".
dlcockrum's avatar
dlcockrum
2,190 posts
 
Dear Sheldon,

It's not physics class. It's music reproduction. All that matters is "sound quality" as perceived by the listener.

Dave
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davide256's avatar
davide256
399 posts
 
I've learned to put my hand firmly over my wallet when someone starts obsessing over measurements... usually what follows is a pitch for "mid-fi" gear where there are no A/B review defenders. I do hope that the original spirit of TAS remains with this site, seeking excellence of sound and ignoring the "midfi" spec game used to manipulate novices in their  audio purchases.
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