This is in response to Allan's mention of litz wire, I should have quoted his post first.
Type two is the closest to what is being used I would think but these are examples of what that particular company produces. You can do the same thing with any copper stranded wire, there are multiple types of bundles that can be woven. They are indeed using litz wire. What I am using is like one little bundle of the type two, it is not multiple bundles, what is shown in the links is more for industrial applications.
I have seen some chinese produce bundles similar to type two because you can use standard equipment to achieve such a braid.
This definition is more in line with what I have learned, it is just from Wikipedia but offers some insight:
Litz wire is a type of specialized multistrand
wire or cable used in electronics to carry
alternating current (AC) at
radio frequencies. The
wire is designed to reduce the
skin effect and
proximity effect losses in conductors used at frequencies up to about 1 MHz.
[1] It consists of many thin wire strands, individually insulated and twisted or woven together, following one of several carefully prescribed patterns
[2] often involving several levels (groups of twisted wires are twisted together, etc.). The result of these winding patterns is to equalize the proportion of the overall length over which each strand is at the outside of the conductor. This has the effect of distributing the current equally among the wire strands, reducing the resistance. Litz wire is used in
high Q inductors for
radio transmitters and
receivers operating at low frequencies,
induction heating equipment and
switching power supplies.
The term litz wire originates from
Litzendraht (coll.
Litze),
German for braided/stranded wire
[3] or woven wire.
[4]
The key is equalizing the amount of time that each individual strand is at the outside of the wire. The article then goes on to explain skin effect. If you do a search for litz braid you will get links to this site where folks are talking about braiding wire. Unless they are using wire with individually insulated strands, I do believe that term is being misused.
Conf\using, is it not?
I work with wire made for high frequencies and some of it has an air core or steel core with copper at the outside of a large single conductor. At high frequencies the signal path is on the outside of the wire, skin effect. This is for frequencies 100,000 hertz and above. Audio frequencies that the human ear can detect are in the 20-20,000 hertz range, if you are lucky enough to still hear those frequencies. That is why I generally say silver plated copper looks nice, but has little to do with sound quality in audio wire. If the wire is solid silver, that is different.
Today I hope to braid some litz wire, in a litz braid, or should I just say I am braiding litz wire. One thing is for certain, skin effect will not come into play much but just like using silver compared to copper, how this wire is constructed in terms of resonance, and proximity may cause it to sound slightly different than other stranded copper wire. Now if I hook this wire to some equipment in my shop and introduce frequencies of say 1 megahertz, then I would be able to measure some marked changes between what is happening with the two types of wire.
Update: I went so far as to examine my litz wire under a nikon inspection microscope and the pattern does not match any of those eight shown. It is 26 awg and there are no bundles as you would see in the examples shown. You will have to take my word for this unless I can figure out a way to do some macro photography later today. Getting a photo through the inspection scope is not an easy thing to do.
Here is more from New England Wire on soldering LITZ:
https://www.newenglandwire.com/litz-wire-termination-guide/
Please note they only mention soldering with a solder pot and to use fume extraction. The wire I used is not nearly the size of what they show, so I had little chance of lowering the temp of my solder pot.