# Subwoofer Impedance (Ohms) Calculator

This calculator determines the total effective resistance of any number of subwoofers in parallel and in series.

## Parallel connection

Enter the resistance or impedance values (in Ohms) separated by commas.

## Parallel Resistance Formula

Rtotal = (1/R1 + 1/R2 + 1/R3 +…. + 1/Rn)-1

## Example Calculation

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.

## Series connection

Enter the resistance values separated by commas.

## Series Resistance Formula

Rtotal = R1 + R2 + R3 +…. + Rn

## Example Calculation

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.