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WTF??? Is this valid or a scam to part fools from their money?
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xrunner:

--- Quote from: GTA on April 14, 2021, 09:56:27 pm ---I know of a couple of people I have come across that would go gaga over these products.

I remember sitting in an electronics class in the 80's and the instructor was going off topic to tell a story of how people get sucked into buying audio amplifiers that has a bandwidth "up to 100KHz". Using this story and explaining that "oxygen-free, piezo effect, high thermal nuclear reaction conductors" doesn't make $300 speaker cable sound better to these people. In the end, they will still be enticed to buy this crap based on sales tactics and marketing claims.

So yes. In the end, people believe in the placebo effect.  :-//

--- End quote ---

Read any audiophile review of any product in that category, and check out the phrases they use, like these -

Greater separation and resolution

No glare or grit

An effortless presentation to every recording

an innately natural, unforced sound

no hint of harshness or whatever

Palpable as all get out

What do those phrases mean? Is it common knowledge exactly what they are implying? How do you measure "glare" or "grit". What does an "effortless presentation" look like on the display of an oscilloscope?

It's all bullshit!
rsjsouza:
What he described as a "power regenerator" looks to be almost as if it were an online UPS unit without batteries - where the output is a PWM generated low distortion sinewave that powers your product. Perhaps the term "regenerator" is common along the audiofolk, I don't know.

Obviously the other topics raised here are valid: a half decent audio system must have a high AC line noise rejection, otherwise you will get all undesired effects; must have a high filter capacitance to hold the DC voltage in power stages; use an isolated power supply to eliminate ground loops, and so on.
schmitt trigger:

--- Quote from: duckduck on April 14, 2021, 05:58:48 pm ---

A rock band by the name of AC/DC uses what they call a "kee-KOO-soo" to convert 120V to 230V and keep the AC regulated. Kikusui starts at 9:22



--- End quote ---
I am going to go out on a limb here.
If you dress like a naughty schoolboy, yet you are one of the meanest guitar players in rock history, who plays at sold-out stadiums, you can indulge in any sort of audio sorcery you desire.
Microdoser:
Wait until he finds out mains electric oscillates 50 or 60 times a second and has hundreds of volts difference between the peaks.
M0HZH:

--- Quote from: GTA on April 14, 2021, 09:56:27 pm ---I know of a couple of people I have come across that would go gaga over these products.

I remember sitting in an electronics class in the 80's and the instructor was going off topic to tell a story of how people get sucked into buying audio amplifiers that has a bandwidth "up to 100KHz". Using this story and explaining that "oxygen-free, piezo effect, high thermal nuclear reaction conductors" doesn't make $300 speaker cable sound better to these people. In the end, they will still be enticed to buy this crap based on sales tactics and marketing claims.

So yes. In the end, people believe in the placebo effect.  :-//

--- End quote ---

Actually ... the bandwidth was related to amplifier slew rate and "speed" errors in the past; a "20kHz" amplifier would be more and more inaccurate past a few kHz which would make even 1-2khz sounds sound bad (by damaging the higher harmonics). Sounds are not sinusoids; a sound with a 1kHz fundamental might even take 10kHz of bandwidth or more.

On top of that, mixing different sounds multiplies the necessary bandwidth. Mix a few sounds at 2-3kHz and their first 3 harmonics, you already need many tens of kHz of bandwidth.
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