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Audio/Video | Press Releases | Speakers/Subwoofers
March 22, 2022

AES Introduces AES75 Standard for Acoustics

Product Briefs:
March 22, 2022

AES Introduces AES75 Standard for Acoustics

The Audio Engineering Society has announced the adoption and publication of AES75-2022: “AES standard for acoustics – Measuring loudspeaker maximum linear sound levels using noise.”

The new standard addresses the need for a practical and cohesive procedure for the prediction of loudspeaker performance. AES75 is the result of extensive work by the AES Standards Committee’s SC-04-03-A Task Group, co-chaired by Merlijn van Veen (senior technical support and education specialist at Meyer Sound) and Roger Schwenke, Ph.D. (Meyer Sound senior scientist and innovation steward).

“The work of the drafting group was deliberate and thoughtful as they carefully refined the standard,” says AES Standards chair Bruce Olson.

“AES75 will no doubt join the most impactful standards that the Society has published in its long history of providing the audio industry with critical tools for analyzing the performance of audio equipment and ensuring interoperability.”

Predictive evaluation of loudspeaker performance based on published specifications has traditionally been challenging due to inconsistencies in both measurement procedures and in how measured parameters are reported.

“Until now reading an SPL number on a datasheet often inspired more questions than answers regarding test signals used and procedures for measurement,” explains Schwenke.

“Most important to the end user is how the loudspeaker will perform with typical audio signals and whether the numbers can be compared apples-to-apples with numbers from one datasheet to another.”

The M-Noise test signal is based on Meyer Sound’s analysis of hundreds of music selections spanning all genres. The procedures documented in AES75 provide measurement of maximum linear sound levels by incrementally increasing playback levels until the magnitude or coherence of a loudspeaker’s acoustic reproduction of the M-Noise test signal reaches an unacceptable state. The AES75 test procedures cover performance measurements of both self-powered and externally powered loudspeakers. 

“AES75 addresses these issues by providing a detailed procedure as well as a specific test signal, M-Noise, whose RMS and peak levels as functions of frequency have been shown to better represent typical program material,” continues Schwenke.

“Furthermore, AES75 is designed to be independently verifiable, using analyzers and microphones typically used by audio professionals. By being independently verifiable, AES75 provides system specifiers and users a much more enforceable metric to use in quotes and architectural specs.”

More news from Meyer Sound: Netflix’s L.A. Screening Room Features Sony Crystal LED and Robust Meyer Sound Audio System

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