There are a few methods to cancel cable interference and twinning is one highly recognized and in fact the same reason why also LoRad power cords so elegantly cancels magnetic fields. The downside is torsion tension, a cable mechanics problem, which SUPRA solved and is able to produce with an interference cancelling short pitch, dynamic music handling and still flexible enough for in-wall installation.
Tin plated.
Typical applications: High powered, also longer lengths and/or in bi-wired or bi-amplified Hi-Fi system or on-stage.