I just checked your system and it says you have a BAT amp and Mcintosh pre 
New or used. Either. I am however under the assumption that I will get better for less used. I appreciate a nice neutral soft presentation. Capable of a large soundstage.
Is this you as well? or is it someone else who is confused?
OP: How are you sending files/streaming to your DAC now?
I looked up that Luxman and it looks pretty good- echoing soix’s post above, what is it regarding the sound are you are looking to upgrade?