Hi !
I bought a second hand Minifuse 4 a few months back and just realized I was supposed to get a power supply with it - in order to enable the USB hub. I didn’t and cannot get in touch anymore with the seller.
Where can I find the official PSU ? I don’t want to buy a random one which could add some parasites / buzzing… RipCord seems to sell a compatible one.
I am really short on USB ports now 
Also, I wonder if using the USB hub adds extra latency. (to the sound and/or to the USB devices plugged into the hub).
Cf. https://support.arturia.com/hc/en-us/articles/4405740980242-Power-Supply-PSU-Specifications-sheet
Thanks a lot !!