Simulation Data

Acoustic simulation software allows the prediction of room acoustic parameters like distribution of direct SPL, reverberation time and speech intelligibility, and even auralization, already during the planning period of a building or a sound system installation. For that purpose the impulse response of a room is determined using methods like mirror image sources and/or ray tracing. The precise simulation of sound systems depends on data sets containing the spatial radiation patterns. Basis for these data sets are spherical measurements of the loudspeaker in an appropriate angular resolution.

Using a rotatable arm (ELF-System), these measurements can be performed fully automated. The results are converted to the current data formats for EASE, Ulysses, CLF (CATT-Acoustic, LARA, Odeon, Ramsete) or assembled to a EASE Speaker Lab GLL. Ceiling speakers can be built into the boundary surface of the measuring chamber, and that way be evaluated in half space conditions. For conventional speaker systems an angular resolution of 5° is advisable, line arrays, having a strong directionality, demand a resolution of 2°.


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Currently the most common format for displaying spatial characteristics is the Ease GLL. Beside the analysis of the entire speaker, the individual channels can be measured separately and, comprising the active or passive crossover network and filter functions, be put together in the GLL. In case of changes in the crossover network or the filters, the corresponding functions in the GLL can easily be replaced, without the need to measure the entire speaker again. Also different speaker models can be integrated in one GLL, and that way be made available to the client in compact shape. The Ease GLL can be opened with the free EASE GLL Viewer.

Preparing the Loudspeaker


Anselm Goertz

Michael Makarski