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Originally Posted by

**Joong** There is science in twist due to generate magnetic dipole or multi-pole of opposite winding neighboring pairs.

However I do not know the reduction due to more than magnetic multi-pole is enough audible amount or not.

I think reactance of cable can be combined with that of driver ( especially dynamic phone) in such that the combination makes a filter to affect sound.

Here I am very interesting in relating to the 2nd or higher order amount of electrical quantity to SQ.

The fundamental order quantity can be easily charted and understood in terms of SQ like THD, IMD, or resistance etc.

However even harmonics impact to SQ is questionable because it is an octave higher.

I want this thread to keep going.

Yes, twisting conductors reduces inductance...but, if the cable inductance is already down quite low, making it a tiny bit lower wouldn't result in an audible change.

Here are some numbers.

16ga flat wire has about .18uH per foot inductance.

16ga twisted wire has about .15uH per foot inductance.

In order to detect an audible change we need to affect at least a .25dB change over a 1/3 octave in the mid band. Since inductance has more effect as frequency goes up, lets look at what it might take to change 20KHz by .25dB. Every speaker is different, but it's not unusual for impedance to be rising above 10KHz. Many speakers end up at around 10 or 11 ohms at 20KHz. So, just working with 10 ohms as an example, for there to be a .25dB loss we would need .29 ohms of inductive reactance at 20KHz. That would be 2.32uH, or 12ft of flat wire, or 15ft of twisted wire. To put it another way, 12ft of flat wire could possibly produce a .25dB loss at 20KHz while 12ft of twisted wire could possible product a .19 dB loss. Thats a difference of .07dB.

The problem is, we can't hear a .25dB change at 20KHz! We only have that kind of sensitivity in the mid frequencies. So, we need a MUCH larger difference in inductance for it to produce an audible effect. And, as you can see, just twisting the same gauge wire won't make nearly enough difference.

You can always say that a speaker with a much lower impedance at 20KHz will produce a more dramatic change. Well, it would have to. We can't hear .25dB difference, so we sure can't hear a .07dB difference. If you had 10 times the wire length, we could talk about it. Otherwise, wire twist, while reducing inductance, doesn't reduce it enough to be audible.

As a footnote, the two wire types used in the examples are manufactures data, and while they are the same conductor gauge, and differ in the fact that one is flat and the other is twisted, conductor spacing has a large effect on inductance as well. The greater the space between conductors, the more inductance. I found it pretty much impossible to find two wires with identical conductor spacing, but differing only in twist. But that fact can practically be ignored, because the figure you need to concern yourself with is the inductance per foot of any wire, twisted, flat, ribbon, or coat-hanger. That, of course, being completely secondary to DC resistance.