A total of 2 reviews of this product on Reddit.
23rd Oct 2020
Sabaj Audio PHA2 $59.
5th Sep 2020
Can we ask what part of Europe, and why RCA connectors? Is that 3.5mm to RCA from the Computer to the Headphone Amp? But standard 3.5mm to the headphones?
Using Amazon-UK, there are quite a few moderately priced Headphone Amps available.
I don’t know your budget, but something like this might do the job –