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Bill wrote:

Have a hum through my center channel speaker, the SET amp of which sits directly in front of the pp200 about a foot away.  It is not relaTED to the DC offset of the 2000 as adjusting that does nothing to the hum, and running the amp from the wall rather than the 200 also doesn't decrease the hum. Thus the 2000 must be giving off a significant field. Moving the 2000 a couple of feet significantly decreases the hum as does running the 2000 on batteries. Also have noted a slight increase in ambiance information while running on the batteries but am unsure whether this is due to more information coming through or less hum from the center channel. The unit does such a great job, far superior to anything else I've used over the years that I've ordered two for a review. Hoprfull that will allow me to run my Crown Macro Reference off one of the units, and the eight SET amps off the other, as with peaks now the pp2000 goes into protective mode with the Crown attached to it as it draws 1500 watts on peaks.

Well, in this unique case we can truly compare notes and we used the SAME unit. What the chance that another two people in the face of the Earth will have two identically performing PP2000.  But how many people out there truly coals to what PP2000 outputs? Do you see anybody beside me measure the PP2000 output – you NEVER see it. Furthermore, I insist that the PurePowe manufacturer do not measure/test their units at all, since all production runs have own set of “behavior” and they learn about it … from customers.

I did not have any hum of any kind, so I can’t comment on this. Most likely, since you have a LOT of equipment in your room, you have a differenced in grounding between your many amps.

The field that PP2000 radiate is significant. It is an impulse amp – an audio equals of a radioactive device – so I would keep it further away from system.  In my ne room I am planning to put PP2000in basement.

About the sonic differences between batteries vs. wall. In some of my PP2000 it did not exist and the unit was measured identically when it runs on batteries or connected to wall. In my unit indeed there is a VERY SMALL difference, I feel a negligible difference. My init also clearly measured identically as they fuck up battery charging circuit and as a result the unit has the “famous fuzziness”. I reported about it a year and a half ago; they promised to fix but what I talk to them I do not feel that we are in the same page as any single conversation with them do not sound like a continuation of the previous one. I only presume that if they fix the “fuzziness” then the difference between the batteries vs. wall will not exist. Now, will they screw up something while they fix the “fuzziness”? No one knows….

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