Speakers sound too bright.

If you had speakers in the same room that sounded good to you, return the speakers.  I had the same issue with B&W 702 S2 towers.  The dealer told me to burn them in for 100 hours.  4 days later they sounded the same.  I returned them.  Life is too short.  A lot of good speakers available that will sound good to you in your room.  Suggest buying from a dealer or direct from manufacturers that will let you buy, try and return if necessary.  

Just make sure your positive outputs from the amplifiers is connected to the positive inputs of the speakers and same with the negative side. Also get rid of the jumper straps.

@rwalsh07 Try one or more Akiko Audio tuning sticks on your Lumin, DAC, and/or preamp. In my system they definitely tame the higher frequencies.

The sound of speakers varies greatly during the course of break in. I try not listen to them during break in because inevitably they will sound awful at some point. I then think I have terrible speakers, when after they are broken in, they sound great. Try not to pass judgment too early.