InfoComm Releases Updated Standard for Audio-Coverage Uniformity

The rewrite extends its application to outdoor as well as indoor areas

Recognizing advances in technology and continual problems in audio coverage, standard Audio Coverage Uniformity (ACU) in Listener Areas (ANSI/INFOCOMM A102.01:2017) has been updated. In announcing its release, InfoComm International, the trade association representing the commercial-A/V industry worldwide and an ANSI Accredited Standards Developer (ASD), noted that, whereas the original ACU standard, released in 2009, was designed for audio coverage in enclosed environments, the 2017 version expands to cover most listener areas. This will have potential implications for both indoor and outdoor sports venues.

InfoComm’s announcement provided context and the purpose of the update. The performance of a sound system can be characterized by several factors, including coverage uniformity, tonal balance and consistency, gain before feedback, and maximum sound-pressure level. The ACU standard focuses on the uniformity of coverage of a sound system’s early-arriving energy to a listener area. An ideal sound-system design allows all listeners to hear reproduced content at approximately the same sound-pressure level independent of the listener’s position in a designated area. This performance standard provides a procedure to measure and a means to classify the uniformity of coverage.

“The updated standard takes advantage of improved measurement platforms, which will allow the user to gain a much better understanding of exactly how a system is performing, opening the door to providing enhanced user experiences,” said Ann Brigida, director of standards, InfoComm International. “There will be greater consistency in results and reporting, and reduced time in the field taking measurements.”

Said Affiliated Engineers Senior Consultant Thom Mullins, moderator for the task group that updated the standard, “This is the first rewrite of a standard, and we learned a great deal in the process. Our goals were to make the standard easier to implement, to bring the standard up-to-date with current measurement techniques and systems, to provide a means of quantifying the performance of a room or system that is easy to understand, and to base the standard on solid evidence and understanding of human perception. I believe we’ve achieved those objectives, and we’re looking forward to the industry’s response and adoption.”

The standard will be available soon at, free for members and available for purchase by non-members. In addition, InfoComm will publish a design guide and field guide to help professionals implement the standard.

The InfoComm Show, the organization’s largest annual conference and exhibition, will take place June 14-16 at the Orange County Convention Center, Orlando.

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