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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: The electricity.Posted by Romy the Cat on: 11/14/2010
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 Romy the Cat wrote:
Ok, I got my two more PP2000, not I have 3 all together and I need to find how to use them. My little celebratory mood with PP2000 is much shorn live and my old PP2000 flying back today to Canada for fixing the problem with the “fuzziness”. The PurePower folks promised to do it fast so, she will be back…

I did not measure the new PP2000 yet, in fact I did not run the system from 3 PP2000 yet – I did not have time to amuse myself with audio last night. What however, I had last night was a sort of disappointment that I do not know how to rectify at this point.

The PP2000 use that I use almost for 2 years was one of the first new PP2000 that PurePower produced. It is not too noisy but it has indicated own presence in a room. So, planning for two more units to drive my two 6-ch Melquiadeses I thought to place the a pair of PP2000 in the basement directly under the PP2000 Melquiadeses.  To do so I made holes in the floor for power cables and accommodated the stands for PP2000 under the floor. I have my electrician to run dedicated 20A lines to the future locations of the  PP2000  in the basement. Furthermore I stressed PurePower to make a remote control turn on/off options on my units, presuming to turn the Melquiadeses by remote turning on the regenerators – each Melquiades will be plugged in own PP2000. So, I thought and planed for everything but I got screwed in a way. The two new PP2000s that arrived turned out to be practically silent in operation. Whatever noise then make they are even comparable in noise with my two years old PP2000. Looking at this silent operation I ask myself why I need to put them in the basement - the can perfectly sit in my room next to the power amps.

So, now, presuming that my current old PP2000 will be upgraded to the silent status I need to revise where I would like my regenerators to stay, revising the location of the holes in the floor and the location of my dedicated 20A lines. The new silent operation of PP2000 is certainly not a bad thing but it does screw up my plans how I thought to use them.
Today I had a chance to do some measuring of one of the new PP2000 and the electricity I use. In US we have mostly 220V, 2 phases come to our houses.  The situation with 2 phases is confusing as I do not know if they are single-phase split:

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/hsehld.html

Regardless if they are 2 phases or single-phase split it is know that one side of 120V is not the same as another side sonically. I made test I find the better sounding side. It was no surprise that the better sounding has less wave deformation. Interesting that that the better sounding part of 220V does sound better even if the PP2000 in use.

Then there was the turn of PP2000. I measured the single PP2000 that power one single 6ch Milq. The PP2000 still deforms sign wave when it sees input choke. With one Milq the deformation is twice lower then with two Milqs + the rest loads – so, whatever the PP2000 is it will be less stressed (deformation) with one Milq – and it is visible on scope.  One Milq made the PP2000 own meter to show 28% of load.

Sonically the new PP2000 is fine, I do not see any significant worsening or improvement compare to what I had before. I do hear a very minor increase in brightness but it might be from other reasons. Sonically the new PP200 is fine it looks like operationally it is fine as well. I did not have any faults of misbehaviors. I did not use the remote control options yet and they run all time - I would like them to burn-in a bit for now.

There is a strange behavior – the internal monitor does not show higher battery charge then 88%. It is not a big deal at all but I presume that after a week of charging the buttery shall be charged. The biggest thing was for me the buttery/line switch. I would like do not see any change any events on sinusoid when unit switch operation from buttery to line. A scope clearly showing that there are evens and the sinusoid has less distortion what the unit run from buttery.  However it is not the deference as I had on my unit, the same “fuzziness” did show up atop of sinusoid but the amplitude of it many-many times lower, practically negligible. Sonically I did not detect any deference between running from buttery and from line, what unit rune from proper side of 220V.

That all combined with the fact that that the PP2000 vintage 2010 is much quilter then it was 2 years back make it nice audition for my playback.  I wish I heard the mode objectively the difference between PP2000 powers 2 Milqs vs. one Milq but there are too many changes in my playback over the last few months and I do not think that I can extrapolate the only PP2000 contribution. I do feel that my playback get some dynamics with each PP2000 powering own power amp. The system is incredibly dynamic but there are so many “new” ingredients in the system that I am not sure how much the PP2000’s donation to this fact.  I might theoretically to run now both Milqs from the same PP2000 and then separate them to two different PP2000 and to report the result but I did not do this experiment and I do not think I have a need to research this subject. Logically a single Milq shall be les load and less distortions – how it affects sound I did not research.

The Cat

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