[Royteane]

I'm using He-500 with nfb10es2, stock cables. For under 400 $ what should be done and alsso the priority for more clarity and quieter background.

Changing headphone cable
Changing usb cable
Changing power cable
Filter capacitor
Regulator
Diodes
Re wire the dac
Bybee in ac
More shield to cable
More shield to dac

 

[jirapatpum]

Id suggest you to get good power cable. Try nordost or kimber cable if you value clarity,focus and speed. For quite background and smooth yet engaging sound try audioquest nrg 4.