ContentDepot: PRSS Audio Loudness Standard

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The PRSS has undertaken an effort to address audio loudness in public radio programs. The effort has been underway but officially began in late 2014 and will extend through 2015 and beyond.
The PRSS Audio Loudness Standard has been set at -24 LUFS, ± 2 LU, audio peaks ≤ -3 dBFS for sample peaks or ≤ -2 dBTP for True Peaks, meaning producers should strive to set their programs’ audio levels at -24 Loudness Units Relative to Full Scale (LUFS), with a deviation range of plus or minus two Loudness Units and an audio peak at or below -3 dBFS or -2 dBTP.
In 2015, the PRSS Network Operations Center (NOC) will begin monitoring all programs, live streams and files, for audio loudness levels. Producers of programs that do not meet the standard will be informed by the PRSS NOC that they are not in compliance. A series of tools, information and training will be made available by the PRSS for producers to help meet the audio loudness standard.
This page will be the repository for all PRSS documents on Audio Loudness along with other materials that may help producers and stations understand and meet the standard.
If you have any questions, the PRSS Help Desk is always available for your comments and questions at at or 800.971.7677.


The NPR Loudness Tool is now available free of charge. This tool allows users to test the loudness levels of their file-based programs and to adjust program levels to move them into compliance with the PRSS loudness standard. Please click here to visit the page where you can download it along with directions on how to install and use the application.




    Loudness Documents

    Loudness Articles (PRSS)

    Loudness Articles (External)