Originally Posted by BpShenanigans
Electronics and three phase power transmission are vastly different. What I stated for a single conductive strand, as in wiring within an amplifier, I stand behind. But, if your system operates at 34,500 Volts, it must truly be hair raising!
The basic math calculations for resistance, capacitance and inductance are the same regardless of wire conductor size, be it #1
gauge for a high power cable or #1
4 gauge for an audio cable...
Capacitance occurs between any two conductors separated by an insulator. In an audio cable, capacitance occurs between the cable's two conductors. Capacitance also occurs between the cable's conductors and any nearby conductive objects, including house wiring and damp foundation concrete. So these capacitances are summed together, note that audio signals are alternating current and so are attenuated by such capacitances. Attenuation occurs in direct proportion to frequency: a higher frequency can more easily leak through a given capacitance. The amount of attenuation can be calculated for any given frequency; the result is called the capacitive reactance, which is an effective resistance measured in ohms.
Note that for the voltage on a speaker wire depends on amplifier power; for a 100-watt-per-channel amplifier, the voltage will be about 30 volts RMS. @ 30V RMS, a 1 percent loss will occur at 3,000 ohms or less of capacitive reactance. Therefore, to keep audible (up to 20,000 Hz) losses below 1 percent, the total capacitance in the cabling must be kept below about 2,700 pF. Ordinary lamp cord which is #1
8 gauge parallel has a capacitance of 10–20 pF per foot, plus a few picofarads of stray capacitance, so a 50-foot run (100 total feet of conductor) will have l< than 1 percent capacitive loss in the audible range. However, some esoteric speaker cables have a higher capacitance in order to have lower inductance; typically this is 100–300 pF. In which case the capacitive loss will exceed 1 percent for runs longer than about 5 feet (10 feet of conductor).
Regarding inductance, all conductors have this, which is calculated by its inherent resistance to changes in current. That resistance is called inductive reactance, measured in ohms. Inductive reactance depends on how quickly the current is changing. Quick changes in current such as in high frequencies can revise to a higher inductive reactance than those for slow changes low frequencies can. Since audio signals are alternating current and thus are attenuated by inductance.
Just my $0.02...