Loudspeaker Multiple Measurement Averaging

Combining multiple measurements, especially for spatial averaging, can result in a more accurate filter design & overall system response.

FIR Designer can average up to two hundred loudspeaker measurements – of any supported format – into a single response that can be used on the Import tab in the filter design workflow.

On the ‘Measurement Averaging’ tab:

  • Select a directory of measurements.
  • Choose a “Reference” measurement. All other measurements are automatically time aligned to this reference.
  • For each of the other “Comparison” measurements, adjust the time-delay, average weighting and polarity.
  • Select one of four averaging modes: Complex, Power (flat, zero phase), Power (minimum phase) and Power (minimum phase + excess reference phase).
  • Finally, copy the average measurement to the Import tab for use in your FIR or IIR+FIR filter design.

Averaging filenames and settings can be saved as an ‘Averaging Session File’ which can be re-loaded into the ‘Measurement Averaging’ tab & adjusted later as necessary.

Currently, Measurement Averaging functionality is only available in FIR Designer (not FIR Creator or FIR Creator EX).

ABOUT MEASUREMENT FILE SAMPLE RATES

Measurement files can have different samples rates and don’t have to match the FIR filter design sample rate. All measurements are resampled to the FIR filter design sample rate as they are loaded.

Using the Measurement Averaging Tab (Step-by-step instructions):