- Feb 23, 2016
Yes, the post you are pointing to, is digging the hole deeper. It doesn't show what you claim it does.
It was public on around july 4th: https://www.audiosciencereview.com/...-khadas-tone-board-1.24596/page-9#post-836011
Now we are in August. Ok, I'll hide that episod.
EMC testings and standards propose common worst mains abnormal shapes/disturbances.
I tested a lot of firmwares of DLAMs and xDLS modems. This being mostly analog/modulated, over copper. Some where buggy (wrong rates, bad SNR, CRC errors, unexpected resynchs...), this was solved by vendors before deployments. Towards millions of DSL lines and modems.
That's exactly what I explained in post #776An operator once conmplained, cause many (several tenth of thousands) of his users didn't get at all the quality one could expect from DSL. The operator expected firmware fixes. All issues where solved by fixing cablings, either in end users homes, or in the operator's copper plant.
I'll reply again: see post post #776I ask again:
Now I'll wait and read only, and see if the experts here converge at some point, and propose more than dimmer at 90°, more than EMC/CE abnormal mains shapes, for "audiophile grade" certifications
and build himself a screamingly expensive RF isolated an-echoic room including the needed equipment?
Dude again grow up!
You just posted a FCC intentional emitter test report that only covers the ISM band(s). That is actually not enough
I have already addressed this before. It's only the prototype we sent to Wolf. All retail units don't have any issues including the one sent to Amir.Lacks knowledge to understand ....
Rohs Complian ... Yup totally believable. Oh FCC marking requirements have changed you don't just put the FCC logo if there is space.
@MrPeabody Amir made the choice to plot TDH measurements, I assume he knows what he did. pma mentionned that that way, he could identify harmonics due to PSU poor PSR. More noise from PSU side, not able to filter mains noises out, this might cause effects in audio stages.
I just asked @Pdxwayne if he could also plot 32 tones, to see. For what difference we could see in harmonics, in the bottom sides on such plots:
View attachment 147488
@b4nt, when you include graphs and articles, when writing responses to what other people have written, you need to try much harder to make certain that the other person actually did say something that is refuted by the graphs and articles. Moreover, when you misquote another person, the misquote is a misquote no matter if it occurs through omission of critical pieces of what the other person had written, especially when it is manifest that the pieces you omitted are absolutely critical to the correct interpretation of the part you quoted. Your defense of the misquote reveals a basic lack of sincerity, which fact is the only reason I am now bothering to draw attention to it again.
I had written this: "In order for an external power conditioner to improve the SQ of an amplifier or other audio component, the two following statements must both be true:" Immediately following that statement, I gave the two conditions on which improvement of the SQ, by an external power conditioner, is inherently predicated. The two conditions are that (1.) Distortion routinely exists on the mains, sufficient in severity such that typical audio components are not able to deal with it, and (2.) The external power conditioner is able to correct the problem by presenting the audio components with an undistorted or less distorted AC mains. These two conditions are the necessary and sufficient conditions by which an external power conditional may be beneficial.
In your response (it was the only one that anyone wrote), you did not question whether the two conditions I identified are the necessary and sufficient conditions. Instead, your response treated those two conditions as claims I was making. This is exceedingly, patently bizarre. In essence you asked me to defend those two conditions as though I had claimed that they are true conditions. It makes no sense at all, for you to have interpreted what I wrote in the manner that you did. As such, it is difficult for me to seriously regard anything that you have to say.
I was very much impressed with Amir's demonstration. Yet, as always, several people objected. One person in particular objected excessively and boorishly. His principal objection was that distortion in the AC voltage matters only if it occurs at the voltage peaks such that there is an affect on current output from the power supply, unaccompanied by a corresponding affect on the DC voltage output by the power supply. This person should have understood that in raising this objection he took on an obligation to demonstrate the validity of his objections, in a manner perfectly thorough as to leave no doubt as to the correctness of his objection. His obligation was to show that it is possible for the output current of a typical power supply to be affected with no corresponding affect observable in the output voltage, and to show that this can occur as a result of distorted AC mains when and only when the distortion occurs at the peaks in the AC waveform presented to the power supply. Eventually Amir got fed up with it and repeated the demonstration with the clipping applied at the peak of the AC waveform. The result was exactly the same as it was previously. The complainer offered nothing in the way of apology or acknowledgement that his objections were not well founded.
There are strong similarities between what that other person did and what you are doing. The onus is on you to show that the distortion that Amir applied is not realistic. I doubt very much that you will succeed in this if all you have is reason why THD is not a good characterization of distortion on the AC mains. I do not know whether you think that this is all you need to show, but if it is, this is a misunderstanding on your part. What you need to do:
(1.) Identify/define the characteristics of AC mains distortion that are typically encountered, i.e., realistic, and such that typical audio components consequently present audible distortion in their outputs.
(2.) Provide proof that the distortion that Amir applied in his demonstration is not realistic, i.e., does not satisfy those characteristics.
What did you get if you run this without phase and EQ engaged? Looks like you might want to trim the last 4 seconds too.