Is it possible to use the HD621 plugged into a stereo DAC

I understand from the manual that it is possible to make the HD621 down-mix everything to stereo CD quality.

It seems to me that I could then plug the first of its SmartLink sockets into my DAC.

This will be a very good way to have all the HDMI sources outputting their sound through the hi-fi.

What do you think?

Eric