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Decide which gauge wire you should use for your particular situation. As a general guide, you should use 12 gauge wire on up to 30 foot runs; 14 gauge wire on up to 18 foot runs; and 16 gauge wire on up to 10 foot runs. Keep in mind that these figures are based on a 4 ohm resistance load, which is typical for the average car audio setup. Many home theater systems, on the other hand, use 8 ohm or higher loads, meaning you can safely run the wires on even longer runs than the above figures without loss of sound quality.