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PSR is defined as the difference between the true-peak level and the short-term loudness ():

In developing Ian Shepherd’s Dynameter, we wanted a crest factor-like measurement that was based on the international loudness standard, ITU BS.1770, so we coined the term Peak to Short-Term Loudness Ratio (PSR). Higher crest factors indicate the presence of more dynamics than lower crest factors. For example, if your peak level is -1 dBFS and your average level is -14 dBFS RMS, the crest factor would be: For that reason, crest factor is more of an abstract concept than a defined standard.Ĭrest factors are measured in decibels. Your “average” levels could be measured in several ways: with a VU meter, an RMS meter or a loudness meter, for example. It is the difference between your peak and average levels: What is Crest Factor?Ĭrest factor is a measure of dynamics. We’ll see how crest factor and PSR are related, how they can be used to measure dynamics and what levels to shoot for. If you’ve ever wondered what crest factor, PSR and PLR mean and what they’re used for, this article is for you.