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.

Center frequency (Hz)

Required number input.

Lower half-power frequency (Hz)

Required number input.

Upper half-power frequency (Hz)

Required number input.

Calculate equalizer center-frequency Q from measured lower and upper half-power frequencies. 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]

Equalizer Q

The resulting equalizer q 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 Equalizer Center Frequency

  Geometric center frequency of a band bounded by lower and upper −3 dB frequencies.

• MEMS Quality Factor

  Calculate a MEMS resonance quality factor from peak frequency and the two measured half-power frequencies.

• Antenna VSWR Bandwidth

  Fractional bandwidth between measured lower and upper frequencies that both meet a chosen VSWR limit.