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
It's really striking when audiophiles ask engineers to tell them how good something sounds. I'd love Stereophile to put on their bench a Guarneri 
vs a Stradivarius. My next concert will be incomplete without precise measurements.
I'd love Stereophile to put on their bench a Guarneri
vs a Stradivarius.
Probably could, if they plugged in.

Cheers George  
@mmeysarosh

Good points about performance measurements. I was surprised about the DAC3. I didn’t expect to hear a difference but I believe I could. It wasnt a difference in sound but more akin to better blacks on a TV - the sound popped out of the background in more detail. Not sure I could detect this in blind A and B tests - definitely subtle. I believe the performance in many of the latest DACs is on a similar excellent par. My speakers have THD distortion below -65 dB across the spectrum and also can play cleanly up to about 120 dB SPL which helps to discern such small improvements at low signal levels.


@defiantboomerang


ATC EL150ASL which is the more aesthetically pleasing elliptical version of the much more affordable ATC SCM 150 ASL big box studio monitor. ATC have been successful at selling pro studio main monitors for over 30 years. These are like a microscope on the recording and not something most people would be seeking for home listening.

Client list

http://atcloudspeakers.co.uk/client-list/

my setup

https://systems.audiogon.com/systems/6257