I'm not sure you can find two cables that measure the same.
Impedance of the cable will change with frequency. It is also very difficult to measure capacitance or inductance since it is "distributed" inductance and capacitance - one affects another. It can be done by measurements at different frequencies and calculations, but it might be not very accurate. Even such simple thing as DC resistance will change with temperature increase (with current). Metal and construction of the cable make a difference.
After that you have other effects, like dielectric absorption or skin effect (that starts at gage 18 for copper at 20kHz). 12 gauge wire uses only 75% of it size at 20kHz (Belden data).
In addition construction of the cable is important. Even speaker cable is electrical noise entry into amplifier. Twisting of the wire, including twist pitch plays a role. How do you measure quality of interconnects shielding?
Of course, one can say "It measures close enough" or "it should not matter", but it is only an opinion and not a proof. IMHO, the only sure way to find two cables that measure exactly the same and have exactly the same noise rejection is to buy the same cable twice.
When you hear a difference between cables it means they must be different (measure different, different construction etc.)
The only other possibility is placebo effect, but there is nothing wrong with it, as long as it works :)
I would not dare to tell other people what they can or cannot hear, especially when my hearing is not getting any better with age.
Impedance of the cable will change with frequency. It is also very difficult to measure capacitance or inductance since it is "distributed" inductance and capacitance - one affects another. It can be done by measurements at different frequencies and calculations, but it might be not very accurate. Even such simple thing as DC resistance will change with temperature increase (with current). Metal and construction of the cable make a difference.
After that you have other effects, like dielectric absorption or skin effect (that starts at gage 18 for copper at 20kHz). 12 gauge wire uses only 75% of it size at 20kHz (Belden data).
In addition construction of the cable is important. Even speaker cable is electrical noise entry into amplifier. Twisting of the wire, including twist pitch plays a role. How do you measure quality of interconnects shielding?
Of course, one can say "It measures close enough" or "it should not matter", but it is only an opinion and not a proof. IMHO, the only sure way to find two cables that measure exactly the same and have exactly the same noise rejection is to buy the same cable twice.
When you hear a difference between cables it means they must be different (measure different, different construction etc.)
The only other possibility is placebo effect, but there is nothing wrong with it, as long as it works :)
I would not dare to tell other people what they can or cannot hear, especially when my hearing is not getting any better with age.