// multi-utility computation suite · offline · instant · precise
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sci.loudspeaker-efficiency-sensitivity Calculator
Calculates loudspeaker sensitivity (dB SPL at 1 m per 1 W) and maximum SPL from rated power and sensitivity. A 90 dB/W/m speaker driven at 100 W produces 110 dB at 1 m — SPL falls 6 dB per doubling of distance in a free field.
Inputs
Pe W
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Spl 1W 1M Db
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
D M
Separation between two points or total path length. Check that units are consistent throughout the calculation.
P Amp W
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Results
SPL at distance d (dB)
The computed distance or separation.
max SPL at full power (dB)
The value at the specified point or condition.
acoustic efficiency η
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
SPL = ref + 10·log(P) − 20·log(d)
Reference formula or conversion factor shown for context.
sensitivity guide
Sample size or count used in the calculation.
sound level at 1W/1m reference
The measured or computed level on the applicable scale.