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The "Acoustic Resistance Box"-A Fresh Look at an Old Principle

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Unidirectional woofer systems preferably use resistance-loaded ports to control the pressure gradient. Analysis of the acoustical analog circuit shows how to optimize the design for any specific purpose: one can trade between box dimensions, frequency range, internal pressure, driver volume velocity, and radiation efficiency. The predominantly resistive rear load on the driver simplifies the application of motional feedback.

JAES Volume 34 Issue 12 pp. 981-989; December 1986
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AES - Audio Engineering Society