While "power" cable needs to be 20 times thicker in car as compared to home audio systems with similar power ratings, the "speaker" cable requirement should not change much. Because for power supply the voltage is reducing by 20 times, but for speakers both home and car speakers commonly have similar nominal impedance ratings. The most common range is 2-8 ohm. What I am trying to say is that to produce a given amount of power from a given speaker, actual voltage/current requirement (which is fed by AMP to speaker) is going to be same, irrespective of whether the AMP is powered by 12V or 220V. |