Speaker Impedance Calculator
Calculate total impedance for speakers wired in series, parallel, or mixed configurations.
Supports 2 to 4 speakers with ohm ratings from 2 to 16 ohms.
Enter impedance for each speaker. Leave unused fields blank.
Enter at least 2 speaker impedances to see results.
When connecting multiple speakers, the total impedance depends on the wiring method.
Series wiring (daisy chain — positive to negative):
- Total = Z1 + Z2 + Z3 + …
- Impedance increases
Parallel wiring (all positives together, all negatives together):
- 1/Total = 1/Z1 + 1/Z2 + 1/Z3 + …
- Impedance decreases
Examples with 8Ω speakers:
| Config | 2 Speakers | 3 Speakers | 4 Speakers |
|---|---|---|---|
| Series | 16Ω | 24Ω | 32Ω |
| Parallel | 4Ω | 2.67Ω | 2Ω |
Important safety note: Most amplifiers have a minimum impedance rating (usually 4Ω or 2Ω). Going below the minimum can damage the amplifier. Always check your amplifier’s specifications before wiring.
Common speaker impedances: 2Ω, 4Ω, 6Ω, 8Ω, 16Ω
The reason impedance matters comes down to Ohm’s law: lower impedance lets more current flow for the same voltage, so a 4Ω speaker pulls twice the current of an 8Ω one at the same level. An amplifier can only supply so much current, which is why dropping the load too low makes it overheat.
That’s the trap in multi-speaker setups. Two 8Ω speakers in parallel look harmless but present a 4Ω load; four of them drop to 2Ω, which many home amplifiers can’t safely drive. Series wiring does the opposite, raising impedance and easing the amp’s job, at the cost of splitting the voltage between speakers. Before wiring several together, add up the resulting impedance and check it against the amplifier’s rated minimum. The figure on the back panel isn’t a suggestion, and going under it is one of the most common ways people kill an amp.
How we build and check this converter
This converter runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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