No, Pat, speaker cables serve as a guide(i.e. more like a monorail than a hose)for the electromagnetic field transmitting the power. It's a relatively high current into a relatively low speaker impedance and it's essentially immune to interference in the home. Shielding, twisting, etc. may be helpful in preventing the very weak signals carried by interconnects from being affected by interference, but are unnecessary for speaker wires and are yet another marketing ploy.

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Enjoy the music, not the equipment.