New expensive power cord for amp and no change in sound?

Trust your ears. There are many PC review videos. Don’t trust reviewer’s ears. Listen to the recording of the actual PC. Comparison videos are better. Microphones don’t lie. Human ears are biased always and they trick us. If I like A sound better than B sound in a comparison video, I like A sound better in real life too. Alex/WTA

Not buying it. The voltage drop across a few feet of power cable can't be more than a volt. This is insignificant compared to the normal variability of the supply fluctuations between 114 and 126 VAC.

@noromance I've measured over 2 Volts, but that was on a class A triode amp that made 140 Watts... or it did if the AC was right. When the spec line Voltage was at 120V the amp only made 100 Watts. The measured AC line Voltage at the IEC connection was closer to 117V as opposed to the Voltage at the outlet. A 40 Watt loss is not only very measurable but also audible.

As I said earlier, the power draw from the line is an important aspect of what you can hear and measure. Internal power supply regulation as well as feedback to allow the amp (or preamp) to reject effects of AC line Voltage have an effect as well. So some people will hear things and others will not.

This also explains why many people report better sound at night (which the AC line Voltage tends to be higher).

Unless there was something very wrong with your last power cord, or it was just a very poorly made one, you're not going to here any differences other than those that occur within your own mind via confirmation bias. This has been tested to death. BTW, no one will ever be able to rank a set of well made power cords by quality based upon what they cost. So spending stupid money on cords would be far better spent on room treatments or better gear IMO. I liken these kinds of gimmicks to the nutraceutical industries claims about their pills and potions-- they (almost) never EVER stand up to any kind of real scientific inquiry. The placebo effect however is very real and in almost all cases, the products never test better than the placebo control group. The claims made by so many ultra-high-end cable companies are pure sci-fi fantasy-- and they have the non-science to back them up! Just go for quality made cables that use quality materials, especially the connectors, and you'll be fine. Don't drive yourself mad buying into voodoo claims made by companies that make obscene profits by trying to differentiate their products with sci-fi lullabies. 

@wesheadley -

Unless there was something very wrong with your last power cord, or it was just a very poorly made one, you're not going to here any differences other than those that occur within your own mind via confirmation bias.

                                               And (again):

          Anyone that feels compelled to harp on not hearing any differences, is obviously too obtuse to understand the term "variables" (as frequently mentioned) and worthy of disregard. 

 The claims made by so many ultra-high-end cable companies are pure sci-fi fantasy-- and they have the non-science to back them up! Just go for quality made cables that use quality materials, especially the connectors, and you'll be fine. Don't drive yourself mad buying into voodoo claims made by companies that make obscene profits by trying to differentiate their products with sci-fi lullabies. 

       Another rerun, since so many of you are a waste of keystrokes:

Cargo cult science is a pseudoscientific method of research that favors evidence that confirms an assumed hypothesis. In contrast with the scientific method, there is no vigorous effort to disprove or delimit the hypothesis. The term cargo cult science was first used by physicist Richard Feynman during his 1974 commencement address at the California Institute of Technology.[1]

Cargo cults are religious practices that have appeared in many traditional tribal societies in the wake of interaction with technologically advanced cultures.

     Do a bit of research and you'll learn those primitives were limited in their understanding of what they saw with their eyes, based on their prior experience, education and BIASES.

                                                A rewind:

                 It isn't that the Denyin'tologists are ignorant.

               It's they're knowing* so much, that's WRONG.

                       *heart of the Dunning-Kruger Effect

                                              OR, two:

     The Church of the Naysayer Doctrine (like every other faith-based, religious cult) has as many dopes as it does Popes.   

     Bring up anything resembling SCIENCE/PHYSICS, dated later than the 1800’s and they become apoplectic, not having the formal education to comprehend the concepts, or- possible ramifications.    THAT would be hilarious, were it not so pathetic!        

           Gimme That Old Time Religion, Gimme That Old Time Religion, etc.

        At the very first mention of something as simple as Wave Function (a BASIC tenet of Quantum Mechanics), the Cargo Cult will label you a KOOK.

        But remember: they can only view/understand you, based on their limited experience, education and BIASES.

         They have overlooked the fact that, if not for the hypotheses/theories and experimentation, regarding Quantum Mechanics: a plethora of modern conveniences, medical devices and the gear they so love, would not exist.

          Had scientists, chemists and inventors shared the doctrines of the Cargo Cult (Denyin'tologists), there would be no semiconductors, computer chips, LASERs, or Magnetic Resonance Imaging devices (MRIs).

                                         Solid State amps?

                                     OOPS (back to tubes)!

                                        Your Smart Phone?

                                        FA'GET ABOUT IT!

                                         Your car's GPS?

                                                NOPE!

    Then too: some may be willfully ignorant and just enjoy being contentious.

                        Others: obtuse, uneducated*, misinformed?

      *Typically, from what's been exhibited here: H.S. STEM, if that, would be a safe inference.

      Either way: the result, when the Cult begins its rhetoric, is a classic demo of the Dunning- Kruger Effect.

                                          But, I digress: 

       Bring up those pesky details, regarding the likes of QED, Dielectric Absorption, Poynting's theorem and possible application/effects, relative to frequency, that our musical signals are carried via photon or wave, outside the conductor and you're a KOOK?

         Again: the Cargo Cult can only understand anyone with an actual background, experience and education in Physics/QED, based on THEIR own beliefs, education, experience and biases

                                      Remember this?.

     One anecdote  that some may find interesting: their walks in the woods and how his father would encourage him to look beyond the fact that something in nature exists, into why and how.

     It saddened him that while attending college, during a visit home and one of their walks: his dad asked what he was learning in college.

     At that moment, Feynman realized: if he tried to explain what he was learning, there was no way his dad could understand.                               

                            It wasn't an insult or condescension.

                                                Just reality.

                                    Oh well: let 'em go build a runway!

                                                    references:

https://en.wikipedia.org/wiki/Applications_of_quantum_mechanics#:~:text=Examples%20include%20lasers%2C%20electron%20microscopes,systems%2C%20computer%20and%20telecommunication%20devices.

https://www.forbes.com/sites/chadorzel/2015/08/13/what-has-quantum-mechanics-ever-done-for-us/?sh=37c459944046

https://uwaterloo.ca/institute-for-quantum-computing/quantum-101/quantum-applications-today

          But: I'm a kook, because I believe in the SCIENCE, from which all that sprang?

     https://www.smithsonianmag.com/science-nature/five-practical-uses-spooky-quantum-mechanics-180953494/

           Einstein got that last one wrong (Quantum Entanglement), BUT- I still wish he'd been alive, when the Hubble Telescope proved, what he considered his, "greatest blunder" (his inability to bring symmetry to his field equation, without lambda).

  https://www.aps.org/publications/apsnews/200507/history.cfm#:~:text=Einstein's%20original%20equations%20had%20been,how%20the%20universe%20will%20end.                                            How about that?

Another example of a hypothesis/theory, with no way to EXPERIMENT/MEASURE, what you're sure must be there, in some detectable way, or another.

                                               Just for fun:

https://www.scientificamerican.com/article/6-times-quantum-physics-blew-our-minds-in-2022/

                                            Happy listening!

 

 

 

"Unless there was something very wrong with your last power cord, or it was just a very poorly made one, you're not going to here any differences other than those that occur within your own mind via confirmation bias."

- prove it