Speakers & PA Calculators
Speaker power, impedance, SPL, crossover, amplifier sizing and cabinet design calculators.
Speaker Power Calculator
Calculate required amplifier wattage for a target SPL at a given distance from the speaker. Free online PA system design calculator.
Speaker Impedance Calculator
Calculate total load impedance for series, parallel and series-parallel speaker wiring configurations. Free online audio calculator.
SPL Calculator
Calculate sound pressure level at any distance from speaker sensitivity and amplifier power. Essential tool for PA and event planning.
Crossover Calculator
Calculate capacitor and inductor values for passive speaker crossover networks at various filter orders. Free online audio calculator.
Amplifier Calculator
Calculate required amplifier power, headroom margin and speaker matching for PA systems and studio monitors. Free online calculator.
Speaker Wire Calculator
Calculate the speaker wire gauge (AWG) needed for your cable length, speaker impedance and acceptable power loss. Free calculator.
Cabinet Volume Calculator
Calculate sealed and ported speaker cabinet internal volume from Thiele-Small parameters. Free online speaker cabinet design calculator.
Port Tuning Calculator
Calculate port tube length and diameter for a bass reflex speaker cabinet at your target tuning frequency. Free online calculator.
Speaker Array Calculator
Calculate delay times and level adjustments for distributed speaker arrays to achieve coherent sound coverage across large venues.
Coverage Calculator
Calculate speaker coverage area and overlap from dispersion angle and throw distance. Plan PA system layout for full venue coverage.
10 free calculators in Speakers & PA
Speaker and PA System Design
Designing a speaker system requires balancing power, impedance, sensitivity and coverage. The SPL (Sound Pressure Level) produced by a speaker depends on its sensitivity rating (typically measured as dB at 1W/1m) and the power applied. Doubling the power adds approximately 3 dB — so to gain 10 dB, you need 10 times the power.
Speaker impedance must be matched to the amplifier output. Wiring speakers in series increases the total impedance, while parallel wiring decreases it. Most professional amplifiers are designed to work with 4 or 8 ohm loads, and dropping below the minimum impedance can damage the amplifier.
Cabinet design is critical for bass reproduction. Sealed cabinets provide tight, controlled bass with a gentle rolloff. Ported (bass reflex) cabinets extend the low-frequency response but require careful port tuning. The port length and diameter must be calculated from the cabinet volume and desired tuning frequency using established acoustic formulas.