I purchased a couple of these.
One of them i plugged into the mains and the other to the power distributor serving my kef ls50.

I noticed that the one plugged into the power distributor had both the polarity and ground led colors red. i removed it and plugged it in the other way but no matter which way i plugged it in the lights were always red. so i left it as is.

the one plugged to the mains seems to be okay because both lights are green as should be.

As for the sound improvement i can say with certainty that the AC ipurifier has definitely made a difference. The soundstage has increased, the notes feel sharper with more zing to them and more importantly the noisy music has become smooth.

i can now even listen to mp3 music :) . I prefer to use Audirvana but jriver and foobar also sound pretty good in this setup.

I just have to figure out why the 2nd ipurifier lights are red then i think the music will become even better or at least thats what i hop :)

enjoy the music!!

Aangeschaft om een "schone" stroom toevoer aan te leveren voor mijn audio apparatuur. Resultaat op het stereobeeld is indrukwekkend te noemen. De toch al lage ruisvloer is bijna verdwenen. Het is alsof er gordijn is weggenomen. Muziek luisteren is nu genieten.

Fantastisch product!!