@laoman
Amir this is blatant nonsense. Are you saying that adding better quality capacitors, improved shielding, an improved power supply, high voltage transformers and decoupling the power supply does not lead to a significant improvement?
First, you don't seem to follow the discussion. Poster claimed that power cables cure modal response of the room. They do not in any form or fashion. Physics dictate that.
As to your new independent claim, you are being very vague. Of course a good power supply needs to be designed internal to your audio gear for it to perform well. This is mandatory. Once there however, you screwing around with power cables, filter, conditioners, etc. is all useless. Completely useless. I have shown this extensively across countless products I have tested.
The best test of this is on purpose feeding audio gear highly distorted AC. My lab AC generator can produce chopped AC. When I feed that to decently designed audio gear, it makes zero change to its output. As it should be. No decently designed power supply assumes clean AC. It converts AC to very clean DC so anything you do up front is useless. See:
This is the AC quality in my my house:
I changed that to this chopped AC:
Look at how much more distorted the waveform is. Yet it made no difference whatsoever to the soundwaves out of the audio gear.
No impact whatsoever. If this didn't change the sound, what on earth do you think a different power cable does???
In every review of cables, I show measurements of the cables themselves as well. Many times they don't even do the things you think they are doing! In a number of cases, they are more susceptible to noise than other way around. You are a complete victim of power tweak companies if you think any of them improve the sound of your system.
Be a good consumer: ask these companies to provide measurements and controlled listening tests. Don't become their PR people, making arguments that have no foundation in reality like what I am responding to.