Thanks for all the responses, many valid points here. @audphile1 You read my mind and I did try the stock cord, no difference. I agree that price is not a guaranteed indicator of performance, and I have always believed that the Gungnir punches above its cost class.
Yesterday I received a new power cord that I had ordered and I installed in place of the stock cord on my preamp. In the process I disconnected the interconnects on the preamp side and reseated them. At the same time I moved the preamp output cables over to the other balanced out just to see if something had happened to channel one. Voile, I suddenly had a much fuller sound, with bass.
I spent this morning backing out changes, putting the stock cord back on the preamp, switching back to output one, still decent sound. The cables are all of decent quality, and I had checked that they were firmly seated several times. I cannot explain it. Just the universe deciding I need some egg on my face.
I appreciate all the responses, I put great stock in all the experience in this forum. I will continue the break in process, something I have experienced with other components, and I believe is real. Still not sure I will keep the DAC, time will tell, just glad to be over this issue. Introducing the Innuos next week, and USB, will be a whole new test. Breaking all the rules of limiting changes, but sometimes that is the way it happens.
And for the curious, the DAC is the Merason Reuss. I was hesitant to speak poorly of it since it is so new and this problem was so apparent. I felt it had to be something other than the product itself.