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Effects of power cords - Page 4  

post #46 of 56
Quote:
Originally Posted by ab initio View Post


Certainly. The typical approach in circuit design is to place much smaller decoupling caps that do block the high frequencies at the supply terminals of any active parts susceptible to high frequency noise on the power lines. While they might not sit in the group of components on the circuit board that you'd draw a circle around and label "power supply circuit," they are still certainly an important part to proper power conditioning in the circuit design.



Cheers

I was thinking of this quote when I wrote about EE's getting butthurt when it is implied that their product is poorly designed: 

Cheers

The butthurt thing was only meant as a joke.
But what you write is 1,000 % true.
I will say no more about this as it will derail the thread.
post #47 of 56
Quote:
Originally Posted by Chris J View Post

 

A basic, textbook, simple linear power supply is not designed to block 1 MHz, it is only designed to filter noise below approx. 10-40 kHz, bandwidth really depends on the power supply caps.

Really a well designed power supply needs to deal with every thing from DC up to maybe 100 MHz.  If not you can have an oscillator on your hands. The high frequency part is very near the devices.

 

Power cords can and do act as interference antennas (both receiving and transmitting).  Power supplies (both linear and SMPS) generate lots of noise and interference.  If you look at the input AC current waveform to a good big amplifier (with a linear supply) you will see at least 175 % THD  and don't be supprise d if it's 250 %.

post #48 of 56
Quote:
Originally Posted by Speedskater View Post

Really a well designed power supply needs to deal with every thing from DC up to maybe 100 MHz.  If not you can have an oscillator on your hands. The high frequency part is very near the devices.

Power cords can and do act as interference antennas (both receiving and transmitting).  Power supplies (both linear and SMPS) generate lots of noise and interference.  If you look at the input AC current waveform to a good big amplifier (with a linear supply) you will see at least 175 % THD  and don't be supprise d if it's 250 %.

True, I've seen power supplies with a fully loaded pf of 0.5 or less.
post #49 of 56
Quote:
Originally Posted by Speedskater View Post
 

Really a well designed power supply needs to deal with every thing from DC up to maybe 100 MHz.  If not you can have an oscillator on your hands. The high frequency part is very near the devices.

 

Power cords can and do act as interference antennas (both receiving and transmitting).  Power supplies (both linear and SMPS) generate lots of noise and interference.  If you look at the input AC current waveform to a good big amplifier (with a linear supply) you will see at least 175 % THD  and don't be supprise d if it's 250 %.

 

Less noise is one thing, better dynamics, bass slam, definition, and my all time favorite: "microdynamic shading", is a whole other thing. If your system is already dead silent, a power cord isn't going to help any.

post #50 of 56

BTW,

here's the power cord the OP is referring to:

 

http://brilliantzenaudio.com/cables/power-cords/

 

It actually looks like an Engineered solution.



Hey!

4800 posts!biggrin.gif
Edited by Chris J - 4/27/14 at 7:06pm
post #51 of 56

Improves pace, rhythm, and timing. Impressive.

post #52 of 56
Thread Starter 

I think I'm just going to have to shift from being annoyed by the thread crappers to laughing at their ignorance. 

 

I think a lot of these folks are just deaf. I've run into people like this... they hear only the coarsest details, but anything having to do with refinement and purity, they don't hear at all.Some people just don't have the ears.

 

Power cords make a very large difference to areas like refinement and purity. The things that are so enjoyable about, say live sound.. the beauty, the microdynamic nuances (there is so much musical expression in the microdynamics), transient speed (crispness of sharp leading edges like piano, the musical expression in flurries of fast notes).There's so much music in the nuance. 

 

When I upgraded my digital cable I was astonished by the new level of musicality. A friend heard it and said, "Yeah, I think it's a little more detailed." What he didn't realize was that in those little extra details was an abundance of new musical expression, all the expressive intentions of the musicians. He just didn't get it. His own system was very rough sounding despite costing close to $100000... he had no power conditioning, no vibration control, cheap wires, etc. Everything went into the amps and the speakers. Yup, there are people like that. And more power to them. May they enjoy their systems. Me, I want nuance.

 

Mark

post #53 of 56
Thread Starter 
Quote:
Originally Posted by Redcarmoose View Post

I also am a true believer in the importance of the cord from wall socket to amp. I don't know why it seems to change the sound but it does. I was a sceptic until I tried different power cords. I do think different amps react different. Some amps maybe more power cord dependent.


The sensitivity of all the other equipment in the chain is also a factor in hearing power cord change outs. I still think it may be something difficult to measure and quantify though the statements in this thread are closer to what I feel is truth than what I have read here in years.

Cheers!

Thanks for the comments. I think power cords make an even bigger difference to the digital source than to amps. I have my best power cord on my DAC.

post #54 of 56
Quote:
Originally Posted by markheadphonium View Post

I think a lot of these folks are just deaf. I've run into people like this... they hear only the coarsest details, but anything having to do with refinement and purity, they don't hear at all.Some people just don't have the ears.

And yet those who claim to have "the ears" and Schiit on everyone else, insulting them by calling them deaf, have NEVER, EVER in the over 30 years the whole cable debate has been raging been able to demonstrate their claimed abilities using JUST THEIR EARS. They always have to peek. When they're not able to peek, they don't do any better than those who they accuse of being deaf. And then they make all sorts of hand-waving excuses after the fact.

Again, this has been going on for over THREE DECADES. You'd think by now SOMEONE would have risen to the occasion and put this to rest by now. But no one has, in spite of the fact that they would be famous and the cable industry would stand make millions more because of it.

It's just been the same old rhetoric. You're either deaf, your equipment sucks, or both. I've been involved in this debate since it began and the insults that people such as yourself spew are just sickening and I think you owe an apology to those you have insulted.

se
post #55 of 56
Quote:
Originally Posted by Chris J 
No DBT discussion, read the rules.

The DBT Free Zone rule is to allow people to share their subjective experiences, provided there are no objective claims of actual audibility, without subsequently being taken to task to objectively substantiate those experiences.

But when you start calling people DEAF, then you're no longer in the subjective world and are making an explicitly objective claim of actual audibility. And once you've done that, you can't go running and hiding behind the mommy's skirt of the DBT Free Zone rule.

If markheadphonium's post isn't going to be deleted or moved to the Sound Science forum, it should be fair game to challenge.

By the way, personal attacks are also against the rules (and I can't imagine calling people deaf as anything but a personal attack). Did you leave a note to markheadphonium reminding him of that as you did to remind me of the DBT Free Zone rule? I bet you didn't.

se
post #56 of 56
Quote:
 But when you start calling people DEAF

 

...your thread ends up locked.

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