I don't think braiding is a good idea, as it doesn't result in small capacitance (which is important for interconnects, whereas inductance is more important for speaker cables). Also, if you are using bare conductors and adding your own insulation, such as a teflon tube, the loose fitting of the sheath means the interconductor spacing varies over the lenght of the cable! Other than for looks, why braid? That's why a coaxial cable seems better, or perhas a spiral carefully wound with regard to spacing, such as in the Venhaus silver spiral on teflon tube recipe. It would be best to have nothing but air between the two conductors, such as attaching them to the insides of a tube, but that's impossible to DIY.
A note about digital cables for those using Jon Risch's recipe (the Belden cable one). He recommends a second shield around the coaxial cable grounded at the source end only, and with a 0.01 uF capacitor to ground at the other end. Unfortuantely, while that size capacitor is small enough to prevent audio frequencies from using the outer shield as a return path, SPICE simulation shows that a digital interconnect needs a much smaller capacitor to do that, perhaps as much as 100 times as small (S/PDIF and AES3 run at several MHz).
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