Hi @iFi audio, thanks a lot for your reply! I live with plot and analysis, being a professional astrophysicist!It seems that you have a keen eye for detail.
The iPower X has much lower noise at 500mA than the iPower Mk2. But at 150mA the iPower Mk2 is quieter than the iPower X.
So, which model would you recommend to power a ZEN Stream? Thank you in advance!