Connect DAC to 2 Systems

I am combining my stereo and HT system in my family room and would like to have both my preamp and AVR connected to the same DAC. This is mainly for other zones. I may want to watch something in the family room and listen to music in another zone or I would just go from the record out on the preamp back into the AVR. Has anyone connected the second output of their DAC to a different system? If so, is there any effect on SQ?