Granny ring, Jetrexpro, all

From what I can see of TWL 7+ pictures, the pairs seems just twisted.

Hi Jazz, If you read some of the reviews of the TWL 7+, they discuss how the 7+ PCs are Litz braided.  I surmised they are using WE wire based on the comments about the wire in the reviews (see below) and reading the strand counts of their various products on their website.  Their cords also have some other things going on such as deep cryo treatment and something they call "passive ground plane technology."   I  have no idea what that is but it could be as simple as a shield connected at one end and spiraling the ground wire outside the shield, or maybe something more innovative.

Below is an excerpt from the PFO review of TWL PCs.  Does the description of their wire source remind you of any companies being discussed in this thread?

Peter Grzybowski, President of Triode Wire Labs, found a highly annealed, durable wire that sounded extremely musical and better than anything they had experimented with prior. The wire happened to be designed by a corporation that was dedicated to the propagation of sound quality, at one time employing 10,000 scientists and engineers! This corporation held a tremendous amount of innovations in audio equipment and devices, such as triode tubes, recording, and acoustics, including the patent for Oxygen Free Copper. From further research, the wire used in Triode Wire Labs products was specified for use in the construction of theater amplifiers (including the 300B) as well as recording equipment (Westrex), with ties to Ampex and Altec as well.

Not being as handy as everyone here I got two of Pete's Digital-American series PCs and I must say, these TWL PCs are simply amazing.
If you can build something like his cables, my hat's off to you but I'm sure there's more going on with his technique than what can be duplicated.

All the best,
Nonoise

If you can DIY, for $90 you get a least 85% of the sound folks. These 10ga DIY Western Electric power cords are just fantastic. 

Jet, I added one silver plated 7N copper to the positive. The mid shifted just a bit up and the bass was more extended so overall IME a net positive result.

mitch2, thanks for the additional info. Indeed any reference to theater amps 300B and Altec rings a very familiar bell. After looking more closely at the pictures, yes, they seem to be Litz braided (one image I had showed a relatively long segment of the hot wire, leading me to question it in the first place). I guess one need to buy one to know more about the passive ground plane. The strip-tease of the AQ Vodka Cat7 cable http://arstechnica.com/gadgets/2015/07/gallery-we-tear-apart-a-340-audiophile-ethernet-cable-and-loo...
showed the use of a combination of copper strands in the middle and the full outer shield.
His Statement series PC (Furutech FI-50 plugs) have "20% overall larger diameter conductors than the High Power “Digital American” and the “Seven Plus” series." I guess he founded spools of WE 9ga (I spotted them on Ebay Hong Kong a couple months ago).
 
Nonoise, great that Pete added another one in the "reasonably priced cable" category which will hopefully benefit many. Now there’s little excuse to try cables out w/o taking out a second mortgage.

My DIY IC, SC and PC are install and forget in my home theater system, lest something dramatically better shows up just for a couple Benjamins.

Now running dual pairs (in bi-wire) of WE 10awg for an aggregate of 7 awg to each speaker.  The resulting sound is excellent.  My next project is going to be a star-quad twist of WE 10awg, with two runs in bi-wire to each speaker for 7awg to both HF/MF and LF, or an aggregate of 4awg per speaker!  The main problem is terminating four runs together per pole at the amp end.  I may need to use to separate runs one with spades plus the other with bananas so I can easily terminate them at a single pair of binding posts.  This stuff is really good and, for the price, almost unbelievable.