Synchronized Swept-Sine: Theory, Application, and Implementation - October 2015
Effect of Microphone Number and Positioning on the Average of Frequency Responses in Cinema Calibration - October 2015
The Measurement and Calibration of Sound Reproducing Systems - July 2015
Some Aspects of the Self and Mutual Radiation Impedance Concept with Respect to Loudspeakers
The radiation impedance concept is employed to establish relations between the near-field sound pressure of a piston in a large wall, the radiated power, and the far-field sound pressure. Attention is drawn to the fact that at long wavelengths the relative pressure distribution across the piston tends to be constant, but not uniform. A recapitulation is given of a simple theory of the mutual radiation impedance for two interacting pistons in a large wall, and expressions for the total radiated active and reactive power are derived. The interaction is strongly dependent on the phase difference between the piston velocities. The influence of the mutual radiation impedance on the function of a vented loudspeaker cabinet has been investigated in detail, and is shown to be decisive below the port resonance frequency. The variations are large but unimportant, as they occur outside the active range of the radiator in question. The findings do not call for changes in design methods.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.