Answer by
swamisarge (283)

Only extremely high power sound requires this size. A little ohms' law yields a rough idea of this: power equals impedance multiplied by the square of the wires' current. A 4 gauge wire handles about 100 amps, so its' square is 10 thousand. Multiplying that by a speaker impedance of 8 ohms equals 80 thousand watts of power, high indeed.