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.





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