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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: Disappointing is not strong enough to express the sentiment.Posted by Romy the Cat on: 12/4/2010
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 manisandher wrote: |
| This is very disappointing to hear.
But in a way, it makes little difference to me. I had decided that I would only use the PP2000 from battery power when listening to music (or making vinyl transfers to digital). I've been playing the system this morning and the battery was showing 45% after an hour or so. This was without the Berning connected to the PP2000. However, I don't think the battery usage meter (or indeed the I/O voltage meter) is particularly accurate.
In any event, in battery mode, the PP2000 makes a worthwhile improvement to the sound of my system.
Mani. |
|
Yes, disappointing is not strong enough to express the sentiments I feel and the most unpleasant and it is purely self-inflicted on my side. Still, Mani, to settle to use PP2000 only in butteries mode is an absolutely ridicules thing to do. I do not even know where to start describing how ridicules it is.
The PP2000 might sound from AC as good as from butteries. I assure you it can, if it were not then I would give up on PurePower long time ago.
I did not talk with PurePower yet and did not open the PP2000. Actually, I do not want to open. I have wasted too time on experimenting with PP2000, I do not want to waste more for debugging it.
Conceptually speaking. The sound of PP2000 from butteries is fine it means that PurePower did not change anything wrong in regeneration stage or post generation filters – that is the most important part. The PP2000 has no transformer but DC-DC converter with typical EMI filters. This is a good article that describes the setting:
http://www.mdipower.com/content/applicationnotes/html/dcpower06.htm
This is very typical, used everywhere and cost nothing nowadays. So, it is most likely that PurePower changed ether the DC-DC converter or the filters or even used other caps in the filters that might give the effect. I truly do not know what is responsible for it but. Generally as I said about the capacitance on primary AC side does it. I am sure if the PurePower review the list of the changed they did then the list of the suspect reason will be very small.
I wish the PurePower did sonic QA of their units after their modifications. For sure the new run of PP2000 is much better from any single perspective but it sound like shit when it runs from AC. I wish that PurePower get that people but it “for sound” and “sound “ it what was accidently killed by some recent changes.
Still, I am very sure that it was done by ignorance or negligence and most like the fix will be as simple as to bite off a wrong cap they put somewhere or something like this. The core of the PP2000 sound, the regenerator looks like was no affected and this is very good. I say “looks like” because I can’t not test the PP2000 ruining from buttery for prolong time as the damn unit runs from buttery for 2-3 minutes only. Mani, you said that your showing 45% after an hour. Mine shows 86% and then shuts itself down… Mystery….
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