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

Mr. kijanki

It is interesting that you contradict yourself in the same sentence.
If you like low DF ube sound, you are welcome.
If you look into a higher DF of SS A/B class or very high DF of D class, it matters.
It is about controlling the speaker's membran (EFM).
The analysis, is going from the speaker point of view of the Amp's output stage, so it (the speaker) is not part of it. It never was. The fact we all cal the cables, Speaker cables is misleading.
Actually, the Amp's makers should have provide their recommendations.
There is a lot of ignorance in that area. The cable makers took it to a whole wrong direction, as they have no idea about their products and the # AWG significe.
 

The kenjit of speaker cables rears his head again, oh joy.

^^^^^^^^    +1

Mr. Dill

Isn't it a bit supercilious to claim your stuff, the way you do, without ever try it yourself?

It is easier to sit at the stand and criticize those who play the game.
It's also a disgrace.

b4icu, yes there is a lot of ignorance in this area, so let me try to explain how membrane damping works. When amplifier outputs positive voltage membrane goes forward. Motion of the membrane is caused by electric current thru the coil. When membrane moves on its own in the same direction it produces back EMF voltage of the same polarity. This voltage will produce current that flows from the speaker to amplifier. This current has opposite direction now, producing force that moves membrane in opposite direction - in effect stopping it. This current is equal to back EMF voltage divided by impedance in the circuit including cable, amp’s output and speaker itself. Even if we assume only resistive part of speaker’s impedance (bass frequencies) it is still about 2/3 of rated impedance. For an 8 ohm speaker it will be likely around 6 ohms. So now you have 6 ohms in the circuit and likely another 0.1 ohm of the woofer’s xover coil. Reducing down cable’s resistance (0.05 ohm for 2x10ft gauge 14 wire), won’t change anything since you already have 6.1 ohm in the circuit.
So, for the purpose of the membrane damping best effective DF=1.5 (nominal 8 ohm divided by resistive part of the impedance). When we choose an amp with DF=25 it will lower overall damping by about 5% (in comparison to DF=2500). Changing wire gauge from 16 to 4 will improve damping by 1% only. The easiest exercise you can do is to take woofer, short it and try to move membrane by hand. It will be hard to move it, regardless if you short it with short jumper or long cable (you won’t feel any difference).