Editing Lumped-element model (section)

== Acoustics ==
In this context, the lumped-component model extends the distributed concepts of [[acoustic theory]] subject to approximation. In the acoustical lumped-component model, certain physical components with acoustical properties may be approximated as behaving similarly to standard electronic components or simple combinations of components.

*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.