Compare 10–16 AWG annealed-copper speaker-wire loop resistance and ideal load ratios for an entered route, temperature, and nominal resistive load.
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Compare one 10/12/14/16 AWG annealed-copper two-conductor loop at an entered temperature and nominal resistive load without choosing a universal gauge or certifying an installation.
See how route length and selectable copper gauge change one ideal series model.
Measure the one-way route, copy the nominal load with its limits, enter conductor temperature and compare retained loop records.
Gets transparent ratios without an “acceptable” or audible-quality verdict.
Keep table units, round-trip length, conductor material and temperature visible.
Reconcile NIST ohms-per-1,000-feet data with the exact product, connectors, route, ratings and measured resistance.
Does not mix per-foot/per-meter units or apply copper values to another conductor.
Separate nominal resistive arithmetic from real amplifier/speaker behavior and regulated work.
Review actual impedance, amplifier/protection, thermal/current, cable listing, connector, fire/route and local-authority evidence.
Does not call the ideal loop safe, code compliant or correct for the system.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
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The selectable gauges use annealed-copper DC resistance in ohms per 1,000 feet at 20 °C. This is not a claim about copper-clad aluminum, damaged cable, connectors, or a manufacturer's finished assembly.
R20 = table resistance × round-trip feet ÷ 1,000The model applies the entered conductor temperature with a 0.00393 per °C copper coefficient. Measure the actual loop when the decision matters.
RT = R20 × [1 + 0.00393 × (T − 20)]The entered load is treated as purely resistive and constant. The voltage ratio is load divided by load plus wire; the load-power ratio relative to zero cable is the square of that voltage ratio.
Vload/V0 = Z/(Z+Rwire); Pload/P0 = [Z/(Z+Rwire)]²Updated: August 2026
The model uses a 50-foot conductor loop and reports the exact table basis, adjusted loop resistance, voltage ratio, load-power ratio, series dissipation share, and insertion ratio.
Hold route, load, and temperature constant, then record each gauge result beside actual cable ratings, terminations, routing constraints, manufacturer data, and measured impedance.
For in-wall, plenum, outdoor, marine, vehicle, commercial, or other controlled installations, treat the arithmetic as one record only. Verify material, listing, fire rating, burial/moisture, routing, connector, and local-code requirements with the responsible professional.
Preserve the table unit and use twice the measured one-way route for the ideal two-conductor loop.
Record the calculation as a bounded comparison and verify actual cable, connectors, impedance, equipment behavior, installation requirements, measurements, and acceptance criteria separately.
This planning model starts with NIST annealed-copper resistance values at 20 °C, adjusts them with an entered copper temperature coefficient, doubles the one-way route for the return conductor, and models that loop in series with an entered nominal resistive load. Real speakers are frequency-dependent loads; cable construction, connectors, installation rating, temperature, amplifier behavior, and local rules still need separate evidence.