So I got my ZSN Pro IEM and while I do find them comfortable, using them with a NU-X Mightyplug MP2 I get a terrible hiss.
Switch to my Arctis Nova Pro (wireless but connected wired) I get no hiss at all, or at least it’s imperceptible.
I have not tried them through my interface, but using the MP2 is my standard practice method. Sadly this won’t work. Maybe there’s a workaround somewhere. I’ll search the web.
EDIT
It seems it’s due to them being more sensative than other headphones and it’s catching the noise floor of my device. Adding an impedence adaptor should help. Now just need to find what ohms to get. According to this thread they recommend 75 ohms. Perhaps I’ll start there.