I am very happy with my Bartók since last February, as well as a DAC, a streamer and a headphone amplifier. So much so, that I added the Rossini Clock.
I have the Focal Utopia headphones, and started to use them with the stock single ended cable.
Recently I switched to a balanced cable to connect the Utopia to Bartók, and was very pleasantly surprised by the big leap in SQ. The output volume raised by 5 - 10 dB, so I had to correct that, but the overall dynamics, transients, and 3D sound stage improved a lot. I upgraded the Utopia stock cable with the Crystal Cable Portable Dream Duet, a custom made cable from Holland. Crystal Cable is a sister company of the well-known Siltech. Terminated with a Neutrik 4-pin male XLR to the Bartók, and Lemo’s to the Utopia. This excellent cable is very thin, consists of monocrystal silver wires, and does not have the heavy weight of the stock cable on the Utopia. Actually it seems to have no weight at all. Only impact.
So I am very curious to hear from other Bartók with HA owners what headphones and cable they are using, and how they like the combination.
And in case you did not read it yet: the most comprehensive review of the Bartók with Headphone Amplifier is here: