Rerurn to Romy the Cat's Site

Last week PurePower send me back my “upgraded” PP2000 unit that eventual get right sound. I did test it running my entire playback from it and found it usable.  I found that there was VERY minor difference in sound between them, so minor that I would never consider it as a problem. So, me second PP2000 is fixed.

So, I plugged last Friday all my front-end along with my ULD amp to one PP2000 and my both tube power amps to another verified well sounding PP2000. On Sundays when I have a day-long ultra-successful marathon with my ULF I noticed that I got in way brighter sound, it did not bother me too much. Then I asked myself where the brightness came from? Upon further research I realized that the brightness came from …. PP2000.

The PP2000 #1 forms fine what all system plugged into it.  The PP2000 #2 does the same with let consider identical sound. The half and half system plagued to different PP2000s pick up brightness and not only brightness but what is the most important some upper range compression. I shall mention that both PP2000 are plagued with all 3 pins to the very same power outlet in the wall. Upon further experiments I connected all system into one PP2000s, got fine sound and then just turned on and off the second PP2000s. The brightness of sound on the first PP2000 was exactly followed the power switch on the second PP2000.

So, what the concussion is. It is known that PP2000, as any switching devise, inject a lot of noise into power line from where it sources power. Apparently the PP2000 own filtration can’t handle the noise from the second PP2000. That sucks.

So, I wonder how to use second and preferably third PP2000. I need somehow to decuple their mutual input noise. It might be a good idea to put them both to different halves of 240V but it might be bit dangers as if my neutrals get switch side with hot then I’ve have 240V ingenerate my whole system. So, I wonder what kind AC decoupling I might use. I need some kind AC diode that will work at low frequency… I do not think anything like this ever exist for lower them a few megahertz….There is another interesting question: does this effect with PP2000 mutual influence to each other  will exist with all condition of electricity in the wall?

Rerurn to Romy the Cat's Site