Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Sensitivity (dB/W/m)

Speaker sensitivity at one watt and one meter.

Amplifier Power (W)

Amplifier power delivered.

Estimate loudspeaker output level as splAtMeterDb = sensitivityDbPerW1m + 10 * log10(amplifierWatts). The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

SPL at 1 m (dB SPL)

SPL at one meter for the given power.

• Audio calculations must distinguish peak, RMS, dBu, dBV, acoustic SPL, electrical power, nominal impedance, sensitivity, and weighting. Loudspeaker impedance varies with frequency, room response changes SPL, and clipping or thermal limits are not represented by a single nominal value.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• SPL From Pressure

  Convert sound pressure to sound pressure level as splDb = 20 * log10(soundPressurePa / 0.00002) referenced to 20 micropascals.

• Audio Compressor Threshold

  Recover the static compressor threshold from one above-threshold input/output level pair and a known compression ratio R:1.

• Audio Expander Ratio

  Audio expander ratio from input-level and output-level changes below threshold, both measured in dB.