Should audio cable be shielded?
As a rule of thumb, remember this: choose spiral shielding for microphone and audio cables. If you are working with high frequencies where there is a lot of EMI, make sure to use foil aluminum shielding.
How do I know if my audio cable is shielded?
Why would you use shielded cable?
Shielding reduces electrical noise and reduces its impact on signals and also lowers electromagnetic radiation. Shielding prevents crosstalk between cables near each other. Shielding not only protects cable but it can also protect machinery and people as well.