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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: More doubt about APSPosted by drdna on: 7/13/2009
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 PurePower wrote:
Without its own source of power it would be impossible to truly isolate the PurePower output from the incoming utility power. That is why there is no difference in sound when the PurePwoer is on battery or it is on utility supply. The output of the PurePower is not dependent on the incoming AC in any way - so the output is as if it was always running on battery.
This is an incredibly asinine statement, given that much of my discussion regarding the PP2000 has been specifically about the specific noise issues I have had that occur only when the unit is plugged in and disappear when it runs on battery power.  This sort of marketing blurb which attempts to educate us as if we had no knowledge of electronics design whatsoever is frankly a bit of an insult.

Admittedly it is just an attempt to answer a basic question which was posed, and it does that. In fact the response here on the forum is a positive thing even though it is marketing. I just think that it is important to get the facts straight before saying something. It does not make me more confident about the company.  However, it is no worse than any other audioo company out there, either.

I guess the issue with the current units is that the AB-type operation of the charging circuit, activating to renew the battery and then deactivating again from microsecond to microsecond, leads to an oscillation between those two states dependent on load and supply.  It so happens that the charging circuit has a ground loop internal to the PP2000 unit which makes this oscillation audible. With my particular load and supply this sounds like a buzzing.

Adrian

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