Sound Power/Pressure Conversion (Room Acoustics) Worksheet

A more detailed approach for sound pressure/power conversion based on room acoustics considerations is given in the Calculation of Room Correction for Surface Properties spreadsheet (98 KB).

This spreadsheet calculator is based on a commonly accepted room acoustics method that computes the relationship between the source sound power level and the reverberant field sound pressure level. The spreadsheet assumes a greater degree of sophistication on the users’ part, and requires that measured data be available in octave bands.

Two scenarios are covered by the spreadsheet:

  • Estimate installed Sound Pressure Level from measured Sound Power Level
  • Estimate Sound Power Level from measured Sound Pressure Level

The spreadsheet may also be used to estimate installed sound pressure level from sound pressure level measured in a different environment sing the following steps:

  1. Enter the volume, surface areas and types for the room in which the measurement was performed
  2. Enter the measured octave band sound pressure levels in Row 45.
  3. Copy the estimated sound power levels from Row 46 and paste them into the input cells in Row 40.
  4. Now edit the volume, surface areas and types to correspond to the room in which the equipment will be installed.
  5. Read the estimated sound pressure levels in Row 41.

Note: Sound absorption coefficients are from commonly accepted sources and are adapted with permission from Noise Control for Buildings and Manufacturing Plants, by Hoover and Keith Inc., Houston, TX, USA.

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