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.

Input Db (dB)

Required number input.

Output Db (dB)

Required number input.

Compression Ratio

Required number input.

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

Threshold Db (dB)

The resulting threshold db returned as a number.

• 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.

• Audio Expander Ratio

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

• PA 1db Compression

  Input power at the measured one-decibel gain compression point from output power and small-signal gain.

• Voltage Attenuator Ratio

  Compute the linear voltage attenuation ratio from output over input voltage.