jazzfan
1000+ Head-Fier
Hi,
This is what we advise - try for yourself as you may prefer different.
Think 'Best for Last'
Rule 1 - if DAC USB Input uses USB Power for more than 'handshake,' iUSB Power should go last, equally iUSB 3.0 should be last in the chain (as they are both from the same mould). There may be solutions with lower noise out there, but we have yet to find them (and measure a lotta gear).
Rule 2 - iPurifier 2 should be as far back in the chain as feasible. As its PSU noise exceeds iUSB Power (not a lot - but still does nonetheless). If used with iUSB Power, it is best off before the iUSB Power, not after. But if the DAC reliably does not draw power from USB, the iPurifier is best off plugged directly into the DAC.
3) On these two recommendations, unless other non-iFi devices can demonstrate better performance, we advise they are used upstream of iFi devices.
Hope this helps.
Thanks for the clarification. For future reference, I just added a link to this post in the How To section of the iFi iPurifier 2 product page.