parasound zDac owners - quick question

Thanks for the feedback.
So it seems its possible to get one that doesnt hum, but at least Im not the only one.
I dont have any dimmers in my house, nor do I typically have any video sources or displays powered up, except my PC. I may try unplugging that and see if there is anyway the PC power supply could cause this.
Again though, all my z's hum, and none of my non-z toroids do. But this zDac is the loudest. At least I cant hear it from my listening position.
Ill probably try to exchange it and see it the new one is any better. If not, Ill probably open it up.

I just took delivery of a ZDac to replace a MuFi VDacII. The ZDac is dead quiet, but I might also be "cheating."

I'm running Balanced AQ interconnects, and have the ZDac plugged into a Transparent PIMM (that's also providing the power to my CDP). The power line itself is running audio only; no dimmers; no computers; and no video monitors.

Have you tried running the ZDac isolated? That is, by itself, away from other equipment, and without anything hooked-up to it. If not, consider plugging it into a quality surge protector/conditioner and, in turn, power that through an outlet that's on a line that isn't being shared by anything.

If the ZDac still hums after you've "quarantined" it on a clean line and by itself, then it's likely the unit is the source for the hum. If you do get a hum, try repeating the quarantine on a clean line at a friend's house. If the repeat trial also generates a hum, then you know it's very likely the unit itself.

Hello Courant,

Thanks for the input. Ive tried it totally isolated, in a power conditioner alone, in a separate room, on a different circuit on the breaker box than anything else. Same effect. I havent tried a different house; maybe I will. Again though, both of my zamp's hum, but none of my other toroid-powered devices hum.
Im probably going to exchange it and see if the new one does the same thing. If so, Ill have to decide if I can deal with it for the long term. It would be a shame to get rid of it after all this time.

Hello Lightspeed, I have the parasound 5250 amp. I had the same hum Fixed the problem w/HumX plug adapter.