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That is true in signal cables, and we all know that. The differences exist in numbers, we all know that, the measurements are there, BJC has tables published, same as other manufacturers, all decent major manufacturer publish the specs of their products, now to what extend those are audible, or not, is the point...

For example, 0.0000001 ohms is far worst than 0.0000000000000001 ohms, do the math as I have not time for that now, and tell me how much is one of the other in terms of %, now are you able to hear that difference in a cable? I bet you don't, even while one is probably a million times bigger than the other.
In audio as in any other field, you have design parameters to accomplished, those are stated by the common practice, we call that practical values, and trust me that mainly all manufacturers follow those, otherwise they are in troubles, that is the whole point, if you feel better having a fancy jacketed cable behind you equipment, that to your ears sound better, that is good with me, but I will not jump in that wagon sorry...

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I made powercables myself and yes it sounded much better then the standard cable delivered with the product! How they relate to other good cables i dunno. I guess anything is better then standard.

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I live in an apt, a brand new apt, I was the first person living it, it was constructed under very strict regulations from the town, that includes proper power and grounding in all outlets, my apt is five years old now, I do not think than any older house will have better power lines, sorry, after living in some of them that do not even comply with the proper grounding...
I have a power conditioner, and a huge interactive smart UPS, that is always on, interacting with the line, to give you an steady voltage...mainly becasue of protection and not for the need off, as my power is really quiet, but I do not hear any difference before and after the conditioners, or before and after the Quails...sorry...

I do not believe in power cords till now, and I have no interest at all, in becoming a power cord zealot. But if this do it for me, and I'm able to hear differences, then good, but if not, that will be the end of the career in the power cords business for me, and trust me that this one was not becasue I looked for it, but again I do not want to be a closed mind, so if the posibility crossed my, way without spending a fortune on them, I will take it....the Power-1 is a $500.00 cable, my Quail cost me 15.00, so there should be a noticeable difference (if this differences exist) but if there is none to my ears, end of the story...

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I have made them myself aslo, Carol (Belden power cable 12AWG from Home Depot) and Marinco power plugs and jacks, no difference neither, I still have it around...BTW the Marinco plugs are a rip off as well, IMO a very poor construction in comparison to any hospital grade plug....

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You do realize that the vast majority of UPS units put out a waveform which is closer to a square wave than a sine wave, with large amounts of high order harmonics which power conditioners have difficulty out? The AC from a wallsocket, depending on where you live may have a THD of around 5% or so, the THD from a line-interactive or offline UPS is usually closer to 50%, and sometimes far worse.

Computers are unaffected since they use switchmode power supplies which don't care whether the incoming AC resembles a sine wave. Typical modern audio gear with poorly designed power supplies, as in anything without properly designed active voltage & current regulation, will be detrimentally affected by all the distortion and RF noise generated by the UPS.

In other words, there's a better than even chance you've shot yourself in the foot by using a UPS.

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That is true only if you are running on its battery which is only when you are without power. Normal operation for most of these to provide regular power out of the wall till power is lost then it shifts to the battery.

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First of all my "typical modern equipment" have all of them, very good PSUs, and that is a completelly wrong assumption from your side, and an absurd generalization, a modern equipment not necesarily has to have a bad PSU, and manily all of them, if cheap, uses switching PSUs, which according to you, will not have any impact anyway what kind of waves they have before...

The vast majority of the UPS does that but not my UPS, it regenerates sinusoidal waves, not square, first of all, it was custom made, also while not in use, as I told you, my apt has a very good power, it just bypasses the power to the outlet completelly...period...only keeps on sensing the line just in case any anomaly in the voltage value is observed, inside certain range of course...

But lets assume that is has all square waves, the worst you can find, guys understand that it will be converted to DC, is that so hard to understand? and filtered later on by huge good capacitors, giving you a DC that will be nearly flat, the amp doesn't care what kind of waves you have before the transformer, if the PSU is good enough to filter all the anomalies, that is voodoo guys!!!! All amps except some tube amp for the filament, work with DC, not square, not sinusoidal, but rather flat DC, what you cna only see is maybe an small ripple, that is perfectly acceptable, but that's it...

Again I'm telling you that in the worst scenario using the UPS, it was not observed any difference from the outlet, same as with the differenct power cords...

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Have tried several on loan over the years - I have a friend whose company use them on Exhibition stands for their equip so that they look 'with it'. Some costing several hundred pounds (x2 $). No change on a standard IEC connector - sorry.

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I was going to say the exact same thing. My amp sounds so much better plugged straight into the wall than into my UPS power strip. UPS are not designed for audio use.

And yes, computers function better with clean power. I've noticed on systems that they crash less, have better audio quality from the sound cards, etc. Any electronic component functions more efficiently with a clean supply of power.

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Then consider yourself lucky to have clean power in your apartment building. But I highly doubt that you have your very own dedicated electrical line. It is shared with other people in your building and noise from their components leaks into yours. Next time everyone in the apartment building is asleep, try your headphone equipment and see how much better it sounds.

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Oh god I don't even want to start on this...

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I think you should burn in the wiring in that new apartment before you can hear any difference at all in any audio component. I've heard that something like 4000 h should do it. You could shorten the burn in period by shorting all the AC-outlets.

Sorry, I meant burn down.

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But I don't believe power affects 50% of sound quality. I posted that for others who think it does. I might invest in a UPS after reading this thread though because they are not too expensive and I want to see if I can detect a difference using one.

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Perhaps but I expect that Red Wine amp I posted took that into consideration. Go read the specs and you will see they most certainly did.

Of course. stock fuse will degrade your good power cords up to 50%

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For christs sake...how can you even quantify that?