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Lx_ wrote:

I do not remember seeing you provide details about this. Could you elaborate on how sound is affected by AC in your system?

Lx, I shut fown my playback in beginning of April, before move, and then got more or less operational playback back in October. I do remember that I mentioned during the last winter that PP2000 changed it way as in January last year I switched my PP2000 to run from utility line – it sounded better then from my dedicated lines, which did not happen before. I do not remember where I posted it, it was too long and my site is too large to look for it. It was nothing alarming, the sound was very good but sometime it was just good and sometime very good. Mind you that behind those “good” I can enumerate very specific and very precise properties of sound. This is not subjective judgment - it was an objective fact.

Later on, in October I wrote in my “New Listening Room” thread.

http://www.GoodSoundClub.com/TreeItem.aspx?PostID=14794

“Today I was thinking all day long what the hell is happening in my room and why the 2” pyramids do the job to subdue HF in my room but still create problem and kill Sound. The ease and spontaneity of Sound the I had just two day back is gone and replaced with labored pressure and not at the high frequency but in upper mid range.  I was thinking listening, changing a lot today in acoustic treatment, even put the large black panels back – nothing worked – the right sound has gone. I played good 5 hours with it and twice fallen from my step ladder – the only think the work properly in my room was gravity… I do not want to give an impression that I love to do all of it too much but I was very pissed as there was some kind of hidden reason WHY it happened and I knew that until I get control over this reason I will not get my Sound in my room. If it was 2 years back then I would blame electricity but now I PP2000 my entire system and I am accustomed that sound does not changed from day to day. “

I remember I have mentioned the similar somewhere else. Honestly, I did not blame the PP2000 at that time as I knew it was running fine, at that time I did not use the new version.  I do not have my old unit (unfortunately), it is upgraded to the new version that has other problems. If I had my old unit then it would be worth to buy a new set of butteries and to compare how the unit insulates from AC compare to the old butteries.  If the new butteries would be better then the measures might be taken to prolong the PP2000 butteries life.

You see, the batteries in PP2000 work in the worst possible condition. Out power never is down and my PP2000, as well as your, was sitting for a year, in my case 2 years, without driving anything.  The acid butteries must work, if they do not discharge anything then they lose capacity. The big and expensive UPS do have built in discharging algorithms,  the small units like PP2000 uselessly do not have it. I am sure that fact that PP2000 looks like a bit screwee does not help ether – my old unit allow to discharge down to 28%, the same “upgraded” unit, with the same battery, do not  discharge more than mid 50%. So, the PurePower has some room for improvement in this department… Still, if the presumption about weakening of batteries and sound is correct then it would be worth to develop a practice one a week to drive the playback from batteries unit PP2000 shout is down. This will train the battery and will make it to live longer. From my collage time I remember that acid batteries need to be discarded no lover then 20%, but it was 25 years ago and the nowadays batteries might be different.

Again, all of it would be applicable to properly operating and sounding PP2000….

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