Shielding is much less important for speaker cables than for interconnects, because the extremely low output impedance of the power amplifier, and the low impedance of the speakers, will tend to "short out" most or all emi/rfi which may be picked up. And also because emi/rfi tends to be at both low levels and ultrasonic frequencies, meaning that the speaker is unlikely to respond to it to a significant degree.
A case could even be made that shielding is even less important for speaker cables than for amplifier power cords. Shielding in the power cord supplying a power amplifier will prevent the escape of emi/rfi that may be caused by inductive kickback from the amp's power transformer, which otherwise might couple into other parts of the system.
BTW, I agree with Krell_man that the op is not a dumb question at all.
Regards,
-- Al
A case could even be made that shielding is even less important for speaker cables than for amplifier power cords. Shielding in the power cord supplying a power amplifier will prevent the escape of emi/rfi that may be caused by inductive kickback from the amp's power transformer, which otherwise might couple into other parts of the system.
BTW, I agree with Krell_man that the op is not a dumb question at all.
Regards,
-- Al