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Energy Limiter for Control of Diaphragm Displacement and Port Velocity

In the audio industry, use of limiters is common practice to increase reproduction level while avoiding overload and ensuring system protection. We describe in this paper a novel energy-based limiter. Using a physical model, the total energy stored in a loudspeaker is controlled to keep the peak displacement within prescribed limits. This technique provides a smooth and precise control of the diaphragm maximum displacement, without change of the spectral balance. It will be presented first for a closed-box system, and then extended to a bass-reflex system, to limit the air velocity in the port and avoid onset of port noise.

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AES - Audio Engineering Society