Speaker Cable Gauge Guide

The resistance to electrical flow (impedance) inherent to a speaker cable results in some amount of power loss over the length of the cable. The power lost depends on the length of the cable and the impedance of the speaker connected to it. To minimize power loss from your speaker cables, use the following table to select the appropriate gauge of speaker cable for your system.
The recommended gauges are based on a power loss of less than 0.5 dB due to speaker cable impedance.

Up to 25 feet:
4 Ohms - 16 gauge
8 Ohms - 18 gauge

Up to 40 feet:
4 Ohms - 14 gauge
8 Ohms - 18 gauge

Up to 60 feet:
4 Ohms - 12 gauge
8 Ohms - 16 gauge

Up to 100 feet:
4 Ohms - 10 gauge
8 Ohms - 14 gauge

Up to 150 feet:
4 Ohms - 8 gauge
8 Ohms - 12 gauge

Up to 250 feet:
4 Ohms - 6 gauge
8 Ohms - 10 gauge