SPC-REFERENCE-TripleC uses a copper foil shield to prevent extraneous noise from entering.
Since most speaker cables on the market are unshielded, extraneous noise can jump in and significantly degrade the reproduced sound.
Some cables have a structure in which the + and - conductors are tightly twisted together to prevent extraneous noise, but if the twisting is too strong, the sound quality will be blocked and the sense of energy will be reduced.
However, aluminum and magnesium foil are materials designed for shielding high-frequency frequencies, and have no shielding properties in the audio band.
Copper foil shielding in the audio band is the most suitable material for shielding in the audio band, and it provides excellent sound quality with excellent S/N ratio without any added characters.