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Dynamic Linearity and Power Compression in Moving-Coil Loudspeakers

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All loudspeakers exhibit changes in their performance characteristics as input drive level is increased. The most pervasive of these effects is the rise in voice coil resistance which accompanies coil heating due to inefficiency of power transfer. Comparative measurements of various loudspeaker designs at multiple drive levels will demonstrate reduction in efficiency,change in fundamental parameters, and other distortion mechanisms which transducers exhibit at high power inputs.

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AES - Audio Engineering Society