I agree. That’s the thing all of those things make a difference
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It seems none of these manufacturers seem to know how to make a proper power cord for their electronics. It makes me question every other design decision they make. If a short power cord makes a difference, imagine what a long power cord might do? Why not use long versions of these amazing power cords to transmit power to a separate, stand alone building that's otherwise off the grid?
Cables and power cords are complicated. Cables that sound great in one system may not sound so good in another. Stereo gear didn’t always come with IEC connectors. I did some diy in the past removing the stock power cords wired into my amps and preamps and soldering in upgraded power cords. Manufacturers added the IEC connector so that people could try different power cords. But HiFi manufacturers have also done much to reject noise coming in through the power cord. For example, I had an ARC SP-6b back in the late 1980s (with the fixed stock power cord). I had a dedicated line going into my listening room. I still had to remove all of the dimmers in the house because if a light with a dimmer was on, I could hear a quiet buzz in my speakers. My later preamps did a much better job rejecting dimmer noise.
The biggest change I have heard with better power cords is actually what I don’t hear. The background gets blacker- quieter. I don’t know how they do it and I thought the background was quiet before I put in the better power cord. That translates to a bigger and more 3D soundstage- more clarity and more focus to the images. The highs get smoother and clearer too. Even just a couple of years ago after I bought a Niagara 5000 power conditioner which made a large improvement, I thought to myself no need for better power cords on my DAC and preamps. I was wrong. I finally tried better power cords and found they improved the sound of my DAC and my preamps.
I don’t like paying for them because they aren’t shiny and pretty like a speaker or amp or one of those hifi turntables* with the foot thick platter, but power cords matter to the sound by a lot.
* I’d love to have one of those grand looking turntables with two, counter-rotating platters. It just looks so cool. But I spent my money on cables.
The problem with naysayers is that they ask for proof, aka too lazy to look and research for themselves. They want us to do the work for them. They sit on their knowledge of “limited facts” claiming “prove me wrong”. However, for the rest on this thread, I’ll post some info:
Regarding Ethernet, quote from Puma Cat at WBF:
”…Respectfully, it's not a "digital signal"; that is only how the data is encoded. The actual signal is an analog voltage "square wave", and as such is susceptible to number of "noise factors", all of which have, and do, exert an audible impact on what is heard. The other important point for folks to understand, is that a lot of folks (most, probably), think that the "noise" rides "down low", at the bottom of the "signal + noise" component of the source "information" being amplified. This is not true: the noise actually rides "on top" of the signal...as such, its deteriorates and degrades the integrity of signal itself As shown here with a digital signal source.”
”The reason that optical fiber provides a benefit is that it does not pass low- and high-source impedance leakage current, and this leakage current results in threshold jitter. Not to get too deep into the weeds here, but even the cores for the isolation transformers in the R45 jacks in an Ethernet switch can have an audible effect.
”Remember, the signal is an electromagnetic wave that propogates down the cable (it is not electrons flowing through the cable like water in a hose or marbles in a tube). The Vp(propogation velocity) of the signal is frequency-dependent, and an electromagnetic "signal" wave can reach the end of the cable and "reflect back", just like water in a tub or pool. This means different frequencies propagate down and reach the end of the cable at different times. And, because the Vp is different for different frequencies, there will be a number of "back reflections" occuring at...different times†.
Masterbuilt Cables were designed by the same government scientists involved in superconductors. When a heated debate on WBF including scientists and engineers over some marketing material, they were all silenced when the supercomputer scientists answered/explained their claims which went way over my head. Even scientists, engineers, etc are trumped by experts in a particular field.
If you want measurements in your cables, perhaps Iconoclast Cables. They have excellent white papers here and here that can educate on the problems and chosen solutions. Excellent read to learn about audio cables.
While a very few want proof aka understanding on how/why cables are better before purchasing, cable manufacturers rarely tell us the secret sauce so others can copy. Most of us are simply interested in price/performance, seeking better sonics.
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