I guess my viewpoint is that if you are concerned about audio quality, you shouldn't be wiring your system this way. You should run the 2-channel output of your processor into an input on your preamp or a processor loop if available before running your preamp into an analog pass through input on your processor. This is a bigger pain to deal with because you need to set the position on your volume control for movies but my perspective is that the noticable loss from movies would be much less than from music using an analog passthrough.
The Krell HTS2 has an analog passthrough.
The Krell HTS2 has an analog passthrough.