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 2 responses by hornguys

IMO, whenever you plan to listen - even after break-in - it's nice to have run the Yggy with a source for 30 minutes to an hour prior to your listening session.
I ’think’ it even sounds better if run with a source prior to a listening session, even if is left on all the time (as mine is).

Not sure if I could reliably tell either way - maybe it’s my own little placebo... :)