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Ian Shepherd Presents "Measuring Micro-Dynamics" eBrief at AES 143 New York

Mike, Ian, Eelco and Paul at AES 143 Left to right: Mike Kahsnitz, Ian Shepherd, Eelco Grimm, Paul Tapper

NEW YORK: November 2nd, 2017 - At the 143rd AES convention in New York last month, mastering engineer Ian Shepherd presented our paper defining the PSR, or Peak to Short-term loudness Ratio, a new method of measuring musical dynamics for optimal online playback. Shepherd was lead author of the paper, which is a collaboration with Ian Kerr (MeterPlugs), Eelco Grimm (Grimm Audio), Paul Tapper (Nugen Audio) and Mike Kahsnitz (RTW).

Loudness normalization is quickly becoming the norm for all major streaming services. This means maximizing loudness isn't the best way to make music stand out any more. Optimizing loudness while making full use of the available dynamic headroom is the new goal. To help with this task, the authors of the paper are proposing a new measurement, called PSR, allowing engineers to easily visualize short-term musical dynamics, and optimize audio for delivery on streaming services like YouTube, Spotify, Pandora and TIDAL.

Plugins like MeterPlugs Dynameter and Nugen MasterCheck already display PSR, and have met with widespread acclaim. However, different manufacturers use slightly different methods to calculate PSR. To avoid confusion, the contributors to this paper are working together to standardize the details.

"Our experience is that PSR meters like Dynameter are highly intuitive and immediate, giving real-time feedback and allowing engineers to quickly and easily achieve the results they're looking for," says Shepherd, who also spoke on Bob Ludwig's "Platinum Mastering" panel at AES this year. "Our users tell us they love being able to mix and master with more dynamics while being confident that their music won't get turned down online, and even stand out more as a result."

"Our hope is that by defining and standardizing PSR, we can encourage more people to start using these meters," says Ian Kerr of MeterPlugs. "Measuring micro-dynamics is an exciting new area with plenty of scope for development, and we believe that collaborating with Grimm Audio, Nugen and RTW will lead to a robust standard and encourage future adoption."

More Information

The full title of the eBrief is "Measuring Micro-Dynamics—A First Step: Standardizing PSR, the Peak to Short-Term Loudness Ratio" and the paper is free to download for all AES members at this URL:


Press Contacts

Ian Kerr
[email protected]

Ian Shepherd
Production Advice
[email protected]