Speaker Wire Gauge Calculator

Thinner wire has higher resistance, which wastes amplifier power as heat in the cable and reduces damping factor. For short runs (under 3 metres) with 8-ohm speakers, even thin wire works fine. For longer runs or lower impedance speakers, thicker wire prevents audible power loss.

For hi-fi listening, aim for under 2% loss. For PA and live sound, under 5% is acceptable. Losses above 10% become audible as reduced bass control and overall level. The loss percentage depends on the ratio of cable resistance to speaker impedance.

Only through resistance. If the cable resistance is low relative to speaker impedance (damping factor above 20), the wire is not a limiting factor. Exotic cable materials and construction make negligible difference compared to simply using adequate gauge for the cable length.

Lower impedance speakers draw more current and are more sensitive to cable resistance. A cable run that works for 8-ohm speakers may cause excessive loss with 4-ohm speakers. Always recalculate when changing speaker impedance or adding speakers in parallel.