PAM (Parametric Acoustic Modelling)

Parametric Acoustic Modelling (PAM) is a computer aided modelling technique for loudspeakers. It is an advance on all pre-existing loudspeaker simulation applications in that it represents waveguides as distributed parameters. Superficially this may seem a trivial advance, but it enables the simulation of impedance discontinuities to behave correctly and thus has enormous significance for all forms of waveguides. In particular it enables waveguides to be structured with custom profiles for particular applications and it provides the designer with significant flexibility to tailor the response of a loudspeaker in a predictable way.

PAM design manifests in loudspeakers as waveguides with one or more selective impedance discontinuities. The impedance discontinuities may be a consequence of changes in cross section, or a consequence of junctions in the waveguide.

PAM can be used to make the response of a loudspeaker flat and at the same time minimise cone excursion by inserting multiple cone minima in the pass band.  Accordingly PAM can be used as the basis of high fidelity, low distortion loudspeakers and subwoofers.

PAM is protected by patents.