AES Standards News Blog

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The AES SC-04-03-A Task Group is creating a webpage on the AES site documenting the adoption of AES75-2023:, AES standard for acoustics – Measuring loudspeaker maximum linear sound levels using noise. It will document the use of AES75 in product and system specifications, product and system evaluation, and list equipment capable of making the measurement.

If you or your firm utilizes AES75 for your own products, provides AES75 measurements as a service to clients, or produces equipment supporting AES75 please contact the Standards Manager to have your information listed on the AES web site.

Contact the Standards Manager

Reaffirmed versions of the following AES standards have been published:

Copies may be obtained here

The Call for Comment on DRAFT AES77-xxxx, "AES Recommended Practice - Loudness Guidelines for Internet Audio Streaming and On-Demand Distribution" was published 2023-05-23

This AES Recommended Practice (RP) provides comprehensive recommendations establishing and implementing an effective Distribution Loudness for streaming and on-demand audio file playback.  It is intended for use by distributors of Internet audio streams and on-demand audio files.

Implementing these guidelines will provide consistent Loudness and appropriate playback loudness range, will reduce audio quality degradation from excessive limiting, will preserve the original artistic intent, and will improve the listening experience. This document does not recommend Loudness Range (LRA), device target playback loudness or device dynamic range.

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Some reports of the Spring 2023 AES Standards Working Group meetings are now online.

SC-02-01 on Digital audio measurements
SC-02-02 on Digital audio interfaces
SC-04-03 on Loudspeaker modeling and measurement
SC-04-08 on Measurement and EQ of sound systems in rooms

 Additional reports will be posted as they become available.

View the reports here

AES75-2023, "AES  standard for acoustics – Measuring loudspeaker maximum linear sound levels using noise" has been published on 2023-05-01.

This standard details a procedure for measuring maximum linear sound levels of a loudspeaker system or driver using a test signal called Music-Noise. In order to measure maximum linear sound levels meaningfully and repeatably, a signal is required whose RMS and peak levels as functions of frequency have been shown to be representative of program material. Various existing standards define noise-based test signals which, like Music-Noise, have incorporated the knowledge that typical program material has a diminishing RMS level with increasing frequency, but Music-Noise uniquely also features a relatively constant peak level as a function of frequency, so that the crest factor (peak level – RMS level) increases with frequency, which an analysis on a large variety of music and other content has revealed is an important additional characteristic of typical program material. The specified procedure determines a loudspeaker’s maximum linear sound levels by incrementally increasing the Playback Level of Music-Noise until a stop condition is met: either an unacceptable change in the transfer function’s magnitude or an unacceptable change in the coherence of the transfer function.

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The spring meetings of the AES Standards Working Groups have been scheduled for May, prior to the AES Spring convention.  

The schedule may be found at

Additional reports of the Fall AES Standards Working Group meetings are now online.

SC-02-12 on Audio Applications of Networks
SC-03-06 on Digital Library and Archive Systems
SC-03-12 on Forensic Audio

Additional reports will be posted as they become available.

View the reports here

The AES75 standard, published in 2022, details a procedure for measuring maximum linear sound levels of a loudspeaker system or driver using a test signal called M-Noise. To measure maximum linear sound levels meaningfully and repeatably, a signal is required whose RMS and peak levels as functions of frequency have been shown to be representative of program material. M-Noise uniquely also features a relatively constant peak level as a function of frequency, so that the crest factor (peak level – RMS level) increases with frequency, which an analysis on a large variety of music and other content has revealed is an important additional characteristic of typical program material.

The AES SC-04-03-A task group is currently in the process of publicizing the standard and establishing a number of assets. One of these will be a webpage—dedicated to AES75—under the AES website. This page will also serve as a directory of individuals and organizations utilizing AES75.

In support of these efforts, the SC-04-03-A task group would like to know if any individuals or organizations are:

§ Using AES75 to specify maximum linear sound levels of products, or;

§ Supporting AES75-compliant measurements in measurement products or solutions, or;

§ Offering AES75-compliant measurement services.

If you or your organization is doing so, please contact the Standards Manager at the link below.

Contact the Standards Manager

Some reports of the Fall AES Standards Working Group meetings are now online.

SC-02-01 on Digital audio measurements
SC-02-02 on Digital audio interfaces
SC-02-08 on Audio file-transfer and exchange
SC-04-03 on Loudspeaker modeling and measurement
SC-04-08 on Measurement and EQ of sound systems in rooms
SC-04-09 on Assessment of acoustic annoyance
SC-05-02 on Audio connectors

Additional reports will be posted as they become available.

View the reports here