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Speaker wire gauge (AWG) sets how much power is lost on a run. A lower number means a thicker wire.
The numbers below are common industry rules of thumb, not a guarantee for your system.
Last updated: October 30, 2026.
Quick Gauge Chart
As a rule of thumb for 8 ohm speakers: 16 AWG works up to about 50 feet, 14 AWG up to about 100 feet and 12 AWG beyond that.
For 4 ohm speakers, use thicker wire for the same distance.
Why Thicker Is Better on Long Runs
Thin wire adds resistance, which wastes power and can slightly affect sound on long runs.
Car and Marine Wiring
For cars, 16 AWG is common for short runs; use marine-grade tinned copper on boats. See our car speaker guide.
Copper vs CCA
Pure copper conducts better than copper-clad aluminum; CCA usually needs a thicker gauge.
Frequently Asked Questions
What gauge speaker wire should I use?
For most home runs under 50 feet with 8 ohm speakers, 16 AWG is typical; use 14 or 12 AWG for longer runs.
Does speaker wire affect sound?
Gauge matters on long runs; beyond that, differences are small.
Can I use extension cord?
Not recommended; use proper speaker wire.
Bottom Line
Pick 16 AWG for short runs, 14 AWG for longer runs or 4 ohm speakers, and 12 AWG for very long runs.
