DIY power cable design considerations

[bucks bunny]

Audio power cable discussions are the most boring on earth.

 

[tombo56]

I said Valhalla and that a simple 12awg solid firealarm cable will outperform it.

🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣
You don't have a tinies clue.

But for anyone who might be interested I`m telling you how to diy a cheap & simple pc that will blow your head off

 

[bucks bunny]

ok, ok, I'll give it another try😆

 

[sesebe]

sensebe:

"A well-designed scheme compensates for these cable influences through dedicated adaptation and filtering circuits so that no matter what cable (within certain limits) you use, no sound changes occur."

This gave me a god laugh. Man, how many years have you been involved in this game? And you still haven`t seen through this?

Please explain! I do not understood your post. If you were closer to me I can make a demonstration.
So a spectral-analiser that work from 9Khz until 20Ghz with a dinamic range of over 160db, over 10000 times more compared with a CD dinamic range, is not influenced by power cable and an audio amplifier that should work only 20hz - 20Khz is influenced?!
This statement make me laugh. How stupid people are to believe commercial nonsense.

 

[Markw4]

a spectral-analiser that work from 9Khz until 20Ghz with a dinamic range of over 160db, over 10000 times more compared with a CD dinamic range, is not influenced by power cable and an audio amplifier that should work only 20hz - 20Khz is influenced?!

Don't know if this particular problem has happened with a power cable or not, but it certainly can happen with radiated EMI/RFI:

LME49720 is also a very good part, but it can be more sensitive to some RF. Works great for things where there is not too much RF getting into it. DECT wireless phone base stations within 10 feet or so can cause FFT spurs every 100Hz. The base stations transmit up around 2GHz. A shielded case will fix the problem though.

I found after a lot of experiments that the 100 Hz and multiples are introduced by HF of my Fritz Box, by WLAN (2.4 or 5 GHz) and DECT at 1.9 GHz into the amp. Going to a place in my house far away from any transmitter, this "Lattenzaun" is gone.

How can RFI affect an amplifier that works from 20Hz-20kHz?
https://www.ti.com/lit/an/sboa128a/sboa128a.pdf

 

[egellings]

It will allways be the conductor that`s closest to the powersupply that matters most, that`s why

Of course it does! How could it not?

 

[sesebe]

And do you still consider yourself engineers after such statements?
Did you read what I wrote 2 days ago?

.................
A well-designed scheme compensates for these cable influences through dedicated adaptation and filtering circuits so that no matter what cable (within certain limits) you use, no sound changes occur.
It often appears in the discussion that the setup is not detailed enough to highlight the influence of the cables, that the amplifier or speakers are not high-end enough.
BUT actually it is exactly the other way around in the sense that the equipment where no sound changes can be perceived are well designed and made in such a way that they eliminate the influences generated by the cables and the equipment that highlights the differences between the cables are superficially designed equipment or that have not implemented filters and the necessary adaptations, for economic reasons, ignorance or, most often encountered, misinterpreted audiophile reasons.

Much more briefly, if you hear differences between different types of power cables, then that device is poorly designed, does not have the necessary filters implemented correctly (sometimes it doesn't even exist at all) and, with all that, it is also significantly more expensive.
............................

 

[Markw4]

One can of course say in theory that every device should be designed for maximum immunity to all noise sources.

However, most people will not pay the added cost for that feature, especially if a unit without it measures well in a relatively clean environment such as, perhaps, at ASR.

Or have they started measuring for noise immunity over there?

 

[sesebe]

Yes, you are right. You will be very appreciated in the eyes of the fans when you spend over 1000E just on the power cable to cover the stupidity you did by buying that very expensive and poorly designed device.

 

[Calvin]

Hi,

He said 'Valhalla!' rotfl

jauu
Calvin

 

[tvi]

spectral-analiser that works with a wide open input from 20-20kHz would be unique i'd think
taking the spectral-analiser out of ts well designed and expensive faraday cage/case and put it in a nice domestically acceptable amp box and see how well it works would be interesting

 

[shambala]

A good design of an audio amplifier may include shields/screen for very small signal stages. As it was currently done 40-50 years ago. Or between power stage and small signal stages.
It is a compromise companies give up mainly because the audiophile image of their products. And of course, because actual op amps are 10-100 times less influenced by small emf, so the effects are small enough to be neglected.