No one actually knows how to lculate what speaker cable they need

@steve cham -- true.  But if the solder or soldered connector  brittle, cracked or oxidized, the pins are oxidized or wobbly, or the metal mismatched then you can get plenty of degradation in sound.  It's happened to me and some serious  pros in a neurobiology lab.  Tens of dollars isn't going to beggar anyone.

Mr. maplegrovemusic
Thanks. They do not get specific, of what that resistance is or what is the cable length. 
However, digital amplification (D class) have a different nature of it's output model (electronics) than A/B Class amplifiers, that are most common. 
Tube amplification is also very different, mostly have high output resistance (relatively to A/B class) or low DF.
Athe calcualtion also do not apply to non coil speakers (as ribbon or electrostatic).

I have tried many cables to drive modified Magnepan MG IIIa’s with a Pass Labs 250.5.  The best so far are DIY five foot cables made with 16AWG .999 pure solid silver inside 1/4” poly sleeve connected directly without termination to amp and speakers.  The two leads per side are keep 2 1/2” apart from each other in a ladder design.  Every 12” a three each piece of plastic plumbers strap is fixed to the cables with zip ties to keep the cables apart.  Total cost: under $7 per foot ($70 for for two five foot cables).  The sound is holographic.  Best bass these speakers have ever produced.  Very revealing mids and highs, particularly with DSD recordings.

Happy listening.

B4icu,

Idiotic, poorly written quote.

There’s basically nothing to ask you, and I’m not going to stroke your ego by feigning respect for your lack of intelligence by posing an inquiry. Instead, I’m just gonna tell you what’s up.

Just making cables thicker only solves the problem of passing low frequency current. Making cables thicker does the exact opposite to higher frequencies due to inductance and skin effect. That’s why practically nobody uses conductors larger than 14g. If more conductor is required, you use multiple conductors.

Cables are VERY low impedance in the audio spectrum; certainly lower than the output impedance of the vast majority of amps out there. They’re virtually inconsequential to the damping factor of an amplifier.

I’m not sure what made you wake up one morning and think you invented the magic formula everybody else missed for 100 years, but I’m pretty sure you didn’t.

8 Ohm nominal speaker impedance +
0.0256 Ohm cable resistance =
8.0256 total nominal amp load.

Amp output impedance 0.016 Ohms
DF (which is a ratio, not units) into 8 Ohms is 8/0.016 = 500
DF into 8.0256 Ohms is 8.0256/0.016 = 501.6

Big difference. Not.