For a public-address system, do speaker cables need to be shielded (noise-protected) and what size (gauge) should be used?

bradx

bradx

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I am currently using a shielded, fire-resistant cable for the speaker system: Heizka Fire Resistant Cable Shielded LSZH 2×1.5 mm² (see: https://heizka.com/fire-resistant-cable-shielded-lszh-2x1-5mm/).
But from my research, I found that cables for audio/speaker systems often do not require shielding.
Could you please advise me on the most appropriate cable type (shielded vs unshielded) and gauge for this application?
Also, has anyone used this Heizka cable above and what was your experience?
 
Wire from the amplifier to the speaker doesn't need to be screened. Wires into the amplifier to need screening
 

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