Time selective techniques that enable measurements of the free field response of a loudspeaker to be performed without the need for an anechoic chamber are presented. The low frequency resolution dependent room size limitations of both time selective measurements and anechoic chambers are discussed. Techniques combining signal processing and appropriate test methods are presented enabling measurements of the complex free field response of a loudspeaker to be performed throughout the entire audio frequency range without an anechoic chamber. With an appropriate choice of stimulus and analysis, it is shown that this technique can also be used for measurements of harmonic distortion.

Christopher Struck is the CEO and Chief Scientist for CJS Labs, a consulting firm in San Francisco specializing in electroacoustics for product design and testing. Mr. Struck has held positions at Brüel & Kjær, GN ReSound, Dolby Laboratories, and Tymphany Corporation. Mr. Struck holds a degree in Electrical Engineering from the University of Wisconsin – Madison, where his studies also included electronic music composition. Mr. Struck is the author of many technical papers, application notes and articles. During the course of his work, he has traveled extensively throughout the world, providing training and lecturing on the topics of acoustics, signal processing, and measurement techniques. He is a Fellow and Past Standards Director of the Acoustical Society of America. He is a Fellow and former Governor of the AES, a Senior Member of the IEEE, and a member of SMPTE and INCE. He is active in US national and international standardization in the fields of acoustics and electroacoustics and heads the US delegation to IEC TC 29 – Electroacoustics and ISO TC 43 – Acoustics.

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