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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: So it is the same but differentPosted by drdna on: 7/8/2009
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 Romy the Cat wrote:
Last night I have an interesting “event”. I accidently unplugged the PP from power line and did not know about it. Also, that was very interesting: when I put the power cable back to power line then the first minutes the PP was hissing and scheming like crazy. 
Yes, I think I wrote about this before, didn't I? Or maybe it was in all the e-mails and phone calls to the APS company?

Anyway, the buzz is actually a lower frequency, so that it sounds less like the hum of the standard ground noise and more like a buzzing saw wave oscillation. There is nothing that can be done to eliminate it except to use it for a different stereo system or to unplug it from the wall. In both cases, the noise goes away. I talked about my experience, basically like Romy's except that I stayed to listen to the unit until it came back to normal operation here in this post just about a month ago, you may recall.

The buzzing is very similar to what Romy describes, but of course it is most intense when the unit is fully discharged. In most cases, as for Romy, when the unit is charged, the charging circuit becomes inaudible. For a few people like me, this is not the case, hence the buzzing. When he heard what equipment I was using, the APS technician said, yes, he knows why this is the case and there have been a handful of other cases reported with the same situation. The new circuit board is intended to eliminate the problem.

At least now, Romy, you have heard the buzz and know what I am hearing when I listen through the PP2000.

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