SC-04-03 meeting report, Berlin, 2014-04

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, 2014-04-28

The meeting was convened by chair S. Hutt.

The agenda and the report of the previous meeting, held in New York, 2013-10-19, were approved as written.

Open projects

AES-X168 Characterization of loudspeaker systems
scope: [To be revised] This document defines a minimum set of characteristics of loudspeaker systems for inclusion in manufacturers' specification documents, and identifies the relevant methods of measurement. The document considers both passive and active loudspeaker systems for professional applications. It does not consider components of such systems such as loudspeaker drivers or crossover filters.

status: This project is active, however the scope needs to be defined.

The meeting reviewed the project's objectives and was reminded that AES-X168 was originally referred to as a part 2 of AES2. J. Woodgate posted a first draft in 2013-05 and will add further proposals. Members are encouraged to review and comment.

W. Klippel suggested that addition of a section on non-linearity at least partially analogous to driver rub and buzz could be valuable and will organize ideas about how this should be defined.

AES-X194 Report on loudspeaker terminology
scope: to provide guidance for how loudspeaker terminology may be interpreted in context to AES standards.

status: Project status made active, scope to be established

Discussions: There is much information on terminology available, particularly with the on-line IEC reference "Electropedia" ( M. Yonge suggested that in the context of AES standards, the word 'loudspeaker' might best be used as an adjective rather than a noun, for example: loudspeaker driver, loudspeaker system. Comments welcome.


No formal liaison discussions. However the meeting briefly discussed ALMA relations and the appreciation for ALMA to continue to support detailed aspects of loudspeaker standards such as sub-components (cones, spiders, voice-coils and so on) that are beyond the scope of the AES.

New Projects

AES-X223: Loudspeaker Driver Correlation Chamber
Replicating non-anechoic loudspeaker driver measurements in different locations is a well known and challenging endeavor due to numerous influences and degrees of freedom. The original AES-X223 project scope is to develop a report, but after some developments by committee members E. Simon and G. Hill, and further committee discussion, it was decided to make the goal of AES-X223 an Information Document.

Hill will organize a first draft with support by the secretariat. Comments welcome.

New Business

No new business was proposed.

The next meeting will be scheduled in conjunction with the AES 137th Convention, Los Angeles, CA., US., 9 to 12 October 2014

AES - Audio Engineering Society