Yamad, I have both but have not used them both at the same time in my system here. I can try adding the iPurifier, but honestly I don’t think that my own results, whatever they are, will really tell you much, as they will be very system-dependent and will vary according to what cables you use and how much EMI you have in your environment. Also, there is a piece of me that says that with 3 things between the usb port on the server and the usb inlet on the DAC, it would be a wonder if the poor signal manages to get there in one piece at all. But I will give it a shot and let you know if I hear anything interesting.
EDIT: OK, I tried it. Honestly I do not think it made any real difference, BUT I am also using a jitterbug, which feeds a Schiit Wyrd, and the cable from the Wyrd to the DAC is very short, so I would have to think that there’s not too much of an EMI problem in the first place, and most of the other issues would have been handled by the Wyrd. So it may matter more in your system than mine. Sorry I couldn’t tell you something more definitive!