are all power conditioners noisy?

I just received a powervar, and I don't know why I didn't think of it before, but this stonkin' big transformer hums!
I've read reviews where they complain abount the amount of fan noise in some companies products.
To me, the power conditioner adding background noise- even though it's not coming out of the speaker, is very distracting.
Is there such a thing as a silent power conditioner, or should I just give up?