Okay Guys,
so the device arrived and here are my results:
Setup:
HP Zbook15 with Kubuntu 16.04 + Sennheiser Game Zero + Topping NX2.
The Topping is recognized as "Audio Codec Analog Stereo" immediately and can be set up as output device.
First finding:
It does not support the Microphone from the headset, so it is only an output port.
Afterwards I downloaded "F-777 - Dark Angel (FREE EP) - 01 Dark Angel (2012 HD Edition).flac" which I found in that forum for test purposes.
Using the Topping as an Amp only does... amping the sound a bit, nothing I would need as my output is loud enough anyway.
Using the Topping as DAC does nothing at all.
It neither improved sound quality nor bass or anything.
So using it on my notebook seems completely useless.
Oh, btw.: My NX2 has MicroUSB Ports instead of MiniUSB as well, so maybe they switched the ports to modern one
Best regards,
Enkhiel