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Resistance scales with length and inversely with cross-section. AWG tables give ohms per foot for copper conductors.
R_total = 2 × length × R_per_foot (round trip)Speaker plus wire form a voltage divider. Higher impedance and shorter runs tolerate thinner wire.
Power loss % ≈ (R_wire / (R_wire + Z_speaker)) × 100Audiophile guidance often targets ≤5% power loss; ≤10% is acceptable for casual installs. Subwoofers with low Z need thicker gauge.
Select AWG where loss ≤ target % at given length and ZUpdated: July 2026
16 AWG copper often keeps loss under 5% — adequate for most living-room stereo pairs.
12 AWG or thicker may be required to limit loss — thin wire noticeably dulls bass on low-impedance loads.
Shorter 15-foot runs to 8-ohm surrounds typically work with 16 AWG; match front L/R if lengths differ significantly.
Long low-Z runs need 12 AWG or thicker. Undersized wire wastes amplifier power and reduces damping factor.
Current travels out and back — use total conductor path (2× one-way length) when calculating resistance and voltage drop.
Long speaker cable runs with thin wire cause voltage drop and power loss, especially at low impedance. Enter run length, speaker impedance, and acceptable loss to find recommended American Wire Gauge (AWG) for safe, full-range delivery.