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m →Acoustics: Remove blank line(s) between list items per WP:LISTGAP to fix an accessibility issue for users of screen readers. Do WP:GENFIXES and cleanup if needed. Discuss this at Wikipedia talk:WikiProject Accessibility#LISTGAP |
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*A rigid-walled cavity containing air (or similar compressible fluid) may be approximated as a [[capacitor]] whose value is proportional to the volume of the cavity. The validity of this approximation relies on the shortest wavelength of interest being significantly (much) larger than the longest dimension of the cavity.
*A [[reflex port]] may be approximated as an [[inductor]] whose value is proportional to the effective length of the port divided by its cross-sectional area. The effective length is the actual length plus an [[end correction]]. This approximation relies on the shortest wavelength of interest being significantly larger than the longest dimension of the port.
*Certain types of damping material can be approximated as a [[resistor]]. The value depends on the properties and dimensions of the material. The approximation relies in the wavelengths being long enough and on the properties of the material itself.
*A [[loudspeaker]] drive unit (typically a [[woofer]] or [[subwoofer]] drive unit) may be approximated as a series connection of a zero-[[Electrical impedance|impedance]] [[voltage]] source, a [[resistor]], a [[capacitor]] and an [[inductor]]. The values depend on the specifications of the unit and the wavelength of interest.
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