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OK, here are my thoughts for today. Below is a very simplified schematic of Pure Power 2000 regenerator.  I do not know if it is, but I think that it is how it works. I do not think that it is different from any other on-line generator. At the link below under the bottom of the first page is a typical operation of such units:

http://www.armspower.com/Products/Powerware/Powerware9330/Powerware9330%20Double%20Conversion%20Online%20Toplogy.pdf

If to simplify everything for PP2000 case then we end up with this:

What we know about the new revision of PP2000 – we know that powering from battery the unit works fine. That means that the yellow past of my diagram are out of suspicion for bad operation. However, when we engage the white elements of my diagram then sound turn shit and it looks like it turn shit not equally on all units. So, I think it would be reasonable to talk about some kind interference that input stages inflict to outputs. What kind interference it might be and the most important how it get propagated to output stages? I think it might be via grounds, air or via wires.  I have no control and no way to test grounds and air theories – this what Pure Power company must do nowadays but I think I can make some tests about the wires propagation interference.

The only wide how the white and yellow sections of PP2000 are connected is the battery (it would be nice if Pure Power would confirm it). So, let see what battery does what unit runs from DC and from AC

The first part of the image the PP2000 runs unit from itself and the second one is what AC is coming in. We see that some AC noise is coming on the negative side what the charger activated. You can get the frequency of the noise – it is 20uSec per square. Also the amplitude of the noise is very low – it is 0.02V per square, so in my mind the charger might works fine. I do not think that exist any higher frequency noise (I use slow 100MHz scope) as this all switching devised that works at 20-30kHz and would be not transparent for any noise over 10-15kHz. So, the interference between AC and DC operation is very low, not to mention that after first DC to DC up-converter it most likely shunted with a large cap that would ground all noise and interference. However, all low voltage logic (and it is a LOT and complex logic) is driven directly from buttery and who knows, might be this minute noise on the negative side makes the low voltage logic to go crazy what it feels it. So, we need to equalize the pane and to make the low voltage logic to see DC identically as it sees when the init runs from buttery. Then, if we still have the problem with sound it will be 100% assurance that the very little noise that butteries get during AC operation is not the problem responsible for sound.

I wish the Pure Power be with me on it as it looks like it is my own problem, anyhow…. My guys advised me to shunt the PP2000 butteries by a pre-charged, large capacitor with a series choke. They explained that butteries have high internal impedance at HF and my external HF filter will deal with all noise.  I need to buy 250,000uF at 100V and try to make the experiment. It would be great if that will be the reason as to address anything else it need to be look on the PP2000 motherboard – something that I do not do. BTW, it would be great if Pure Power make this as the have all equipment setup for those experiments… But it is only if they want results….

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