SC-04-03 meeting report, Berlin, 2017-05

Report of the meeting of the SC-04-03 Working Group on loudspeaker modeling and measurement of the SC-04 Subcommittee on Acoustics, held in Berlin, Germany, 2017-05-22

The meeting was convened by chair S. Hutt.

Members of the working group and other attendees introduced themselves.

Richard Cabot, the AES Standards Manager, read the AES patent policy statement.

The agenda and the report of the previous meeting, held in Los Angeles, 2016-09-30, were approved as written.

Projects assigned to this group but not mentioned here had no action requested or required - see for details.

Open projects

AES2 Review of AES2-2012: AES standard for acoustics - Methods of measuring and specifying the performance of loudspeakers for professional applications - Drive units
Review is required in 2017. There is strong interest in updating the AES2 standard. It will require time to work through details but we manage good progress and issue an update in 2017. Otherwise we will need to reaffirm AES2-2012 before the end of the year while we continue to work on revisions with a target date of 2018.

This document is due for formal review in 2017, with reaffirmation the most obvious outcome. David Murphy will provide a report on suggestions some post processing that can be added to AES 1ID as an addendum, target prior to AES143rd, Oct/17.

AES-X168 Characterization of loudspeaker systems;
Status: IEC 60268-21 Part A (-21) & Part B (-22) have progressed. Through discussion it was agreed that the X168 scope and proposal should be updated to reflect a focus to professional systems, a category somewhat out of the scope IEC 60268-21 & -22. David Murphy has agreed to lead the project.

AES-X194 Report on loudspeaker terminology
It was agreed to terminate this project due to redundancy of available resources.
Please refer to the following links:

AES-X223: Loudspeaker Driver Correlation Chamber: Information Document:
An updated draft was posted to the TCLH web site.
Please review and comment. After a call for comments is distributed & if no comments are received the secretariat will draft a formal version.

AES-X241 AES Standard for Acoustics - End of Line Testing for Production Loudspeaker Drivers
Richard Stroud has written a first draft that is posted to the TCLH web site.

At this meeting (142nd) the committee recognized that the original scope precludes some drivers with brackets or in enclosures that are often used in automotive applications. It was agreed that the last line of the scope should be modified:

scope: This standard specifies parameters and methods of measurement required for end-of-line quality control tests performed on loudspeaker drivers manufactured for automotive, consumer and professional applications. It includes requirements for mechanical setup. DELETE(It does not consider measurements of loudspeaker systems or multi-driver arrangements.) ADD(Application is to components and/or sub-assemblies.)

Activities around this project also include a survey begun by Dr. Farina to gather feedback on what kinds of test parameters are important for eol validation. A link to Dr. Farina's survey will be provided.

It was also agreed that the appendix should contain information to guide users with information about parameters that are not required to validate that an end of line tested device conforms to its specification.

Intent Target: Release 2018


No new actions.

New Projects

See above.

New Business

There was no new business.

The next meeting will be scheduled in conjunction with the AES 143rd Convention in New York, 2017-10.

AES - Audio Engineering Society