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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

Showing 4 responses by david_ten

david_ten
5,480 posts
 
@gbmcleod   Looking forward to hearing about the Yggdrasil and where it falls for you. I have found it responds well to isolation, so your use of the Townshend platforms will help stretch it's performance. If you are using the USB input, make sure you get the Gen 5 board installed, should yours be an older unit. Holiday Cheer!
david_ten
5,480 posts
 
@gbmcleod I’m in the camp that finds the Yggy needs time to break in. A week will be a good start. I suggest 3 weeks. (This is for a brand new Yggdrasil).
david_ten
5,480 posts
 
Yes on both counts. I was expecting the differential with the power cord, but I was more surprised at the improvement made when I swapped in footers which was after the power cord swap.

I've posted this elsewhere...the Yggy is designed to a price point and is exceptional at that price point...but the good/bad news is that it will respond to changes such as power cabling and isolation, etc.
david_ten
5,480 posts
 
I substituted the power cord immediately. I also removed the very 'basic' footers. 
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