Does Lumin x1 needs a dac ? does a good dac will improve it ?

Totally wrong. The dac in the Lumin is pretty decent but not even in the same league with the new Denafrips Terminator 2 that is without question 

for $4500 it is a great dac and if not bough5 direct this dac would easily 

be $10 k  I have heard the x1 thetop R2R  dacs are just so natural and analog 

sounding and the powersupply alone weighs more then the Lumin it’s 42 lbs 

add a Hermes dcc reclocker and for under $5500 a great digital setup 

That will stand up to Any dac in the $10 k range .i tested a Bunch of digital 

through our tri state audio club  streamer dac combo ,streamer dac, 

the dcc reclocker cleans all incoming then reclocks the signal with. Very high quality  dual temp control oven clocks  to I2S to the dac ,it is a ideal setup.imo

the best setup under $10 k 

Hamir I couldnot disagree with you more.

the terminator with Hermes reclocker,and BNC 45 MHz,and 49Mhz clock sync 

all for $5500 it was much better then the X1 lumen ,throughAurender 200 streamer 

there was much more realism and dynamics ,sorry no Sabre dac ,is better then a very good R2R dac  and for dynamics not even close , just pop the top in the Lumin 

and then check out the Huge Dual -0 core transformers massive capacitance with 

Ultra caps and at least 200 for filtering alone .Anyone looking just physically look at both The Terminator 2  has only been out for 4 months  you probably heard the version 1 , even if you didn’t,as I mentioned  the Hermes Dcc reclocker  total $5500 delivered and weighs 54 lbs together 42 lbs on its own .i have been doing audio 40+ years and owned a Audio store I think I know quality very well ,just compare apples 🍎 to 🍏 .