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Lx_ wrote:

Those recent posts of yours are making me wonder whether my PP2000 unit is really faulty, as PurePower acknowledged on this very forum. After all, you are starting to recognize that PP is sensitive to incoming electricity in your own units. This makes several cases where we have strong suspicion (if not actually convinced already) that wall electricity still has an impact on Sound, even though PP is supposed to filter it.

Lx, it is very difficult to correlate notes about sound over internet. Yes, I begin to recognize that PP is sensitive to incoming electricity but it is all about degree. It looks like my unit now is properly operating (dose it?) and I do sense that there is SOME degree of sensitively to incoming electricity. Sound get a bit better or worse but it all still in more or less acceptable form. The November 3 units that I had were in very different scale. They sounded not a bit better or worse but unlistenable horrible, converting all sound into boring, gray monochromic unitone. So, I guess the faulty or not faulty is about the degree of being a bit worse vs. to be the worst. As you understand it is hard to convey over internet.

Lx_ wrote:

In my case, difference in Sound is not outstanding, but once you know what to listen for, you can easily say when Sound is fine (no appliance on) or not. Also, I have appliances drawing several kW, and this leads to a reduction in dynamics, as well as adds micro-level noise that makes timbres a little less accurate and phrasing tends to disappear. Overall Sound is a bit more dull.

Lx, I like how you describe Sound. Yes, what you describe are both characteristics of faulty unit and none- faulty unit, the key point are degree.  The faulty unit will have subdued phrasing and eaten dynamic contact even with best electricity. It will be colorless. It will be like a TV with max out brightness but with turned off saturation. Knowing what was wrong in the faulty unit there is one test that you might easy perform. Play a loud orchestral crash with bass drum.  I for 15 years use is my reference Swan Lake crash that I feel is juts perfect for me. If you feel that playback clip or sag under the crash then your PP is faulty. Make sure that it is NOT your amp or speakers are clipping however. The properly operating PP2000 shall keep your cash very clean to the very moment what the voice coils will fly out of your woofers.

There is another very easy test: the sound of bassoon-like instruments. Lasted the overtones of those woodwind instruments. The sophistication of HF overtones while they do their basic notes shall instantly give you the snapshot of the health of your PP2000.

Lx_ wrote:

Could each of you tell me if they are using dedicated AC line to feed their PP? If not, can you hear a difference in sound when 1-2 kW are drawn by appliances in your house (typically heaters at this time of year)?

I have a dedicated lines but I use one half of my utility lines. It sound the best among all 3 chooses I have. I have no explanation for that.

Lx_ wrote:

This episode of fantastic electricity gave me excellent dynamics and oooh, so good phrasing. It reminded me of the recent test I did when running on battery. Now that test was very short, because my battery is now almost 2 years old and cannot hold longer than 10-15 minutes, so I cannot be certain. But if PP on battery is indeed as good as fantastic electricity, it means that at least PP does not add noise to incoming AC. This is new for me, I suspected the charging (or some other) stage might leak into output. Of course it also means the PP is useless in case of fantastic electricity (which almost never happens for me). Now PP filtering should be improved so that input noise is removed and output sounds as on battery or with fantastic electricity.

Yes, the PP from battery is fantastic. The PP from AC most of the file is very close to what is from  battery. I might be that later prodaction of PP are more sensitive to electricity then before. I it very difficult to make a definitive conclusion.

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