rowuk wrote:

What connection do we have considering the spectra of signals on the mains and sound quality? What data do we have on what part of "mains contamination" affects sound quality?.

Amir wrote:

rowuk wrote: What connection do we have considering the spectra of signals on the mains and sound quality? What data do we have on what part of "mains contamination" affects sound quality?. No body knows answer of This question and you can ask it about all other components like measurements of loudspeaker , amplifier , dac and ...All We know about this question is very very limited but i am just curious to compare other spectrals. I am waiting to look at the spectral in good electricity days. It may be useless but i would like to do that. Another thing i would like to consider is harmonic spectral of purepower 3000+ as i heard very minor minor effect of high frequency on midrange texture. I think if any body use ferrits to control pp3000 high frequency then i would like to see it’s spectral before/after using ferrits with purepower.I think we may find useful information maybe not.

Paul S wrote:

Amir, please report methodology and results, whether positive or negative.

Paul S wrote:

Again, oscilloscope traces of PP output have been posted in this long thread showing conclusively that PP output is NOT a "perfect sine wave"; rather, they output pulsed square waves, and we know they foul the air and all conductors around themselves.  But -- apparently --  they foster musical umami that many like when their output is fed to hi-fi equipment power supplies. Best regards, Paul S

Amir wrote:

the interesting thing is Pure Power 3000+ Sensitivity to AC quality. when the AC is good then the Pure Power has very smooth sound with great transparency and when the AC is not good the Pure Power 3000+ has less transparent sound with a-little (very minor) harsh sound.

Amir wrote:

I have used two Pure Power 3000+ in series but the result was not good.

Romy the Cat wrote:

First of all, if you have multiple of PP3000 then be advices that them connected in parallel substantially descries sound quality for each of them. Then might be use ONLY at different phases of some measures should be taken to decuple them by other means.  Amir wrote: the interesting thing is Pure Power 3000+ Sensitivity to AC quality. when the AC is good then the Pure Power has very smooth sound with great transparency and when the AC is not good the Pure Power 3000+ has less transparent sound with a-little (very minor) harsh sound.      How methodologically you distinct the contribution to sound the come from regenerator vs the nastiness that come from power lines? I mean when the elasticity is very bad and you have the reported “harsh sound” then I presume that this harsh sound is caused by bad electricity. You feel that “Pure Power 3000+ has less transparent sound … harsh sound”, so why do you feel that it is the PP3000 the one that has less transparent sound if the harshness comes from power lines?  Did you developed any techniques to differentiate the PP3000’s own harsh sound from power lines harsh sound?  Amir wrote: I have used two Pure Power 3000+ in series but the result was not good.  You absolutely should not do it. The topology of the digital regenerators like PP make them unstable and in fact dangers to be connected in series. The PP should warn the customers against doing it and in fact drop any warranties if somebody insist to use PP in this configuration. Hypothetically it is possible to use PP in series with an insolation transformer between them but then the measures should be taken to decuple then via ground, which brings own bad of the problems. Anyhow, I do recommend if you are not familiar with topological idiosyncrasies of series connecting of switched power supplies then do not connect PP in series.

Amir wrote:

I think if you use Pure Power 3000+ it is better to use shorter power cables (2m is very good) . the bass and attacks are better with shorter Power cables. you should not have any ground loop in your system if you use Pure Power 3000+. it is very very important. ground loop degrades the sound easily and you will not have natural transparent upper mid and high frequncy. It is very important to separate cables from each other . when there is more than 10cm distance between cables the sound is better.

rowuk wrote:

We really do not need reports of voodoo or a last wet dream. If you want to be taken seriously, describe the test procedure and outcome of each test. What does „better bass“ mean in this context?

Romy the Cat wrote:

It would greatly depend from what kind power cables he uses and how the PS supplies are made in the devises tat the power cable connected.  My liquid isolated cables have no bass unless they sit undisturbed for a few days. Is it voodoo? Yes, it is, bit it is commonly acknowledged by the manufacturer and by anybody who ever used PAD cables. Cables are freaky. Who the hell would believe that digital cables might have different sound but we all know they do…

Paul S wrote:

... we make innumerable compromises and arrive at the "best" version of the sound we want for the minimum amount of time per day/week/month/year we will accept from our "solution" ...

drdna wrote:

So, I am of the opinion that most anyone can hear the differences. We just don't understand the physics of why it makes a difference. Just make sure you do it in a double blinded fashion, and be ready to accept that sometimes the less expensive fancy option will be better! Adrian

rowuk wrote:

Amir,in my world there is a process for selection and it is not AB or changing power cords. That does not mean that I deny that equipment (including cables) can change sound. It means that the normal audiophool description "it was immediately better" does not match my view of the way that things work in music. We are creatures of habit and to have meaningful comparisons, we need a period of acclimation. We will always gravitate to what we are used to and changes in the beginning are always more dramatic then they are after we get used to the new situation. In my world, I try something new exclusively for weeks/months and then switch back to the previous setup. Then Bias Confirmation is NOT part of the process. I follow some of your posts and I see more "stereophile" or TAS behavior than serious reference points. You seem to believe that hardware will solve your problems. I disagree with this stand. Solutions are between the ears and once hardware is not the focus, things can improve very quickly. By the way, if your speakers are properly positioned, then you NEVER move them - especially if the voodoo only made the bass better.

clarkjohnsen wrote:

the righteous immediacy of short-term auditions needn’t be dismissed