Speaker Impedance Calculator

Calculate total impedance for speakers wired in series, parallel, or series-parallel. Verify your configuration is safe for your amplifier and see power distribution.

Total number of speakers to wire

Impedance of each speaker (common: 4, 6, or 8 ohms)

Select how speakers are wired together

Minimum safe impedance for your amplifier

RMS power output of your amplifier

Parallel: Z_total = Z / N (same speakers) | Series: Z_total = Z1 + Z2 + Z3... | Series-Parallel: Z_total = (Z x 2) / (N/2)
Four 8-ohm speakers in series-parallel: Each series pair = 16Ω, two pairs in parallel = 8Ω total. Safe for a 4Ω minimum amp.

What is speaker impedance and why does it matter?

Speaker impedance (measured in ohms) represents the electrical resistance of a speaker. It determines how much current flows from your amplifier. Matching speaker impedance to your amp's rated range is critical: too low impedance can overheat or damage your amplifier, while too high impedance reduces power output.

How do I calculate speaker impedance in parallel?

For speakers wired in parallel, divide the impedance of one speaker by the number of speakers: Z_total = Z / N (if all speakers have the same impedance). For different impedances: 1/Z_total = 1/Z1 + 1/Z2 + 1/Z3... For example, two 8-ohm speakers in parallel = 4 ohms total.

How do I calculate speaker impedance in series?

For speakers wired in series, simply add all the impedances together: Z_total = Z1 + Z2 + Z3... For example, two 8-ohm speakers in series = 16 ohms total. Series wiring increases total impedance, which is safer for your amplifier but reduces power output.

What speaker wiring configuration should I use?

Use series wiring when you need higher impedance (safer for the amp, less power). Use parallel wiring for maximum power output (lower impedance, but ensure it stays within your amp's minimum rating). Series-parallel combinations offer flexibility for multiple speakers while keeping impedance in a safe range.