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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.

Post Subject: Internal ground loop in PP2000?Posted by drdna on: 2/22/2009

Paul S wrote:
It is confusing, but the NEUTRAL is not only "referenced to ground", but in properly-designed components it is THE ground. If the PP2000 is a 120V device with a 3-prong plug, then it has 2 references to ground within its chassis, depending on how it is configured, and thus it MIGHT be possible for it to contribute to a ground loop or loops. How it winds up using either or both ground connections will be determined not only by its internal configuration but also by the configurations of each and every piece hooked up to it, along with the ultimate configuration of the super-circuit this creates

Exactly.

Antonio J. wrote:
Considering that PP2000 isn't plugged into a dedicated line and that line can be shared by other electric devices plugged into the grid, I wonder if the hum noise is getting into the PP2000 not from the ground wire, but the neutral wire for some defect in other device. Maybe leaving the system on playing music which allows hearing the hum, and making a ride all over the house unplugging electric devices and switching off lights discovers the cause.

This would be disturbing, because this is exactly what the PP2000 is supposed to cure, isn’t it?

Romy the Cat wrote:
I advised you do not plug all your components into PP20000 but to plug all your components into a power strip and then to plug your power strip I not ONE out of PP20000. My rational was is that if the PP20000 introduce some kind of differences of ground potential between the outlet number 1 and outlet number 5 (that I SERIOUSLY doubt but if it is the case then it would constitute a faulty unit) then using just one outlet you will not have this problem.

That is a thought; I will try that.

It is interesting to note that even though there is this buzz, I still consider the PP2000 to be a success. To me the buzz is like the clicks and pops on an old record. It can be annoying at some point, but it does not change what piece was recorded or what musicians were performing it. And overall, the improvement to the ability to deliver the Sound is improved.

Adrian

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