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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: PP2000 with lifted groundPosted by Lx_ on: 1/2/2011
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 Paul S wrote:
I suppose there are the usual strong strictures against it, but has anyone tried lifting the (3rd wire) ground only during wall-powered operation?  Best results, whatever that might mean, would require a "dedicated home run" for the neutral wire.

Actually I have reported problems with my unit operating better on the battery than when plugged on AC soon after receiving it in April 2009. Basically, I can hear the heaters getting on/off, the water heater and pretty much everything dirty on the AC line (switched PS and the likes!). One wonders whether the PP2000 even has any filtering capability... BTW my PP2000 is alone on a circuit from the breaker box, but that does not provide much isolation as noise clearly finds its way back from ground/neutral through that box.

Among the tests I did at the time, I tried lifting the ground at the PP input. This improves things a little, but it is not as good as running on battery. When I say "on battery" I mean completely unplugged. I did not test leaving the PP plugged in and playing with the "input breaker" switch on the back panel.

I even suggested then that there may be a problem with the isolation of the AC line/battery inside the PP2000. The French importer told me that APS had detected an issue on their european model. He ordered a newer unit where this had been fixed. Unfortunately the importer then simply vanished God knows where and I got stuck with my unit.

From what I read here I now doubt very much that those problems were at any time solved by APS (at least knowingly).

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