Well, since the noddin/E-stat sub-thread has now stepped into a confusing muddle of misinterpretation, mis-recontruction and loss of context where we can't seem to agree on the fact that we're not disagreeing...

I'll just ask a question about the link E-Stat provided above regarding the graph of HF noise. In the interest of fair disclosure--although I admit I don't think I have the capacity to hear wall wart induced noice in my system--at heart I'm a skeptic. Even though those with claims have better ears and better systems, I will doubt until convinced otherwise. Doubt is not to be confused with disbelieve. So no personal slight is intended.

I read the text and looked at the chart. As far as I can tell the sound measurements are taken from the noise the wall wart is making directly to the ambient environment. ie not any noise the wall wart may be introducing into the downstream audio chain that comes out your speaker. I'd like this clarified for me.

If all the past posts about the glories of high end power supplies, how wonderful they are and everyone should by them were a simple referendum on the ambient noise they don't make, then I have completely misunderstood. My take was that the argument on wall warts was that they degrade downstream audio quality within the electronic chain to the speakers--an argument I'm skeptical of.

Also, the differences are presented in dB, which I believe is a signal to noise ratio and not a measure of absolute noise. I presume you can have a huge signal to noise ratio between two values that both fall in a completely inaudible range. As is, the chart doesn't convince me that there is any perceptible difference in wall warts. I don't know what a zero Volt ref is, but I assume it's a very very very quiet reference (the quieter the reference the greater the more exaggerated the dB value). Clearly the chart isn't using the standard SPL scale and that alone would be misleading to the casual reader.

If this is all about cheap power supplies buzzing, specifically at 50 or 60hz. That can certainly annoy a person, even me. My low tech solution is to plug into a more distant outlet and run an extension cord. I can understand the lack of appeal though.