This calculator determines the total effective resistance of any number of subwoofers in parallel and in series.
Enter the resistance or impedance values (in Ohms) separated by commas.
Parallel Resistance Formula
Rtotal = (1/R1 + 1/R2 + 1/R3 +…. + 1/Rn)-1
Consider four subwoofers in parallel with the following resistance values: 1 Ω, 6 Ω, 15 Ω and 100 Ω. The total effective resistance is 0.80 Ω.
If you have two subwoofers – one having large and the other small resistance values in parallel, the effective resistance is closer to the smaller value. Take for instance 1 Ω and 100 Ω in parallel. The effective resistance is 0.99 ≈ 1 Ω.
Enter the resistance values separated by commas.
Series Resistance Formula
Rtotal = R1 + R2 + R3 +…. + Rn
Consider four subwoofers in series with the following resistance values: 1 Ω, 4 Ω, 10 Ω and 12 Ω. The total effective resistance is 27 Ω.