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First of all, guys, can you name your posts on more identifiable way?

A few comments I would like to make. I heard that the new revision of PP2000 has fans that do not run at full speed all time but have the speed of fans driven by thermosensor. It is good but not too huge as I did not detect that fans noise in PP2000 was a problem.  The noises that bother your, Meiko, is not the “noises from capacitors”. Capacitors have no noise. The noises you comment upon are the switching pulses themselves go over PP transformers I presume.

The might be loud if you drive A lot of power and if you PP2000 sits right next to your listing location. I hope the APS will look at it in future. It shell not be so difficult to damp the noises at source, putting the source in a little patted sarcophagus. It might be the issues with cooling the thing but I am sure it is resolvable. The APS never care about it as this unit stated as a commercial UPS devise where noise never a problem. Now the APS is a few years in the audio market and I think it does make sense for them to calm down the switching noise. If you look at all class D power amps of 3-5kW for audio then they all run practically silent, not to mention that they run at higher caring frequency then PP2000 does. So, the switching noise might be easily addressed.

Still, at my level of priorities I would not considers it as a big deal. The PP2000 is in away a “radioactive” unit that shall not sit close to playback anyhow. I keep my in closet with open door. The good thing that the switching noise is relatively HF and it is very directional. So, it beams from PP2000’s holes and it is not hard to keep it out of listening area.

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