IFi iusb power supply and conditioner any info?

Well, I unplugged the units for awhile and when I plugged them back in, the periodic pops are gone. Thank you! I guess I didn't have one of the cables in properly.

However, I still like the sound better without the iFi units.
Audiosource, and Ppeters did your units require break in time?

As the iFi units burn in more (now 100 hours) it seems to be getting better.
At this point it may be a keeper.

How does the IFi compare to the Kingrex double-cable and power unit? Anyone hear both on the same system?

It's doing some great stuff right now for my Mac Mini > Bel Canto uLink > Bel Canto DAC3 playback. Just got it Saturday, so about 100 hours on it. Bass is now better rendered, soundstage width and depth better, greater treble extension, lower noise floor, and overall more relaxed and transparent presentation via the ST fiber link and using Nordost Heimdall USB cable. I used to think that the fiber link had some roll off and attenuation, but not anymore. Not so great recordings aren't prettified, though.

Just got a dual headed usb to use with the IFi power unit. I was amazed that I can actually unplug the power usb and everything continues to play.
I must say I have been very surprised with this unit and I am glad I bought it.