A disk in a circular baffle is a useful model for an open-baffle type loudspeaker and in the limiting case a loudspeaker without a baffle of any sort. Loudspeaker drive units are often measured in a finite baffle such as the rectangular IEC 268-5 baffle. See IEC 60268-5, ed. 3.1, “Sound system equipment - Part 5: Loudspeakers,” available from http://webstore.iec.ch/
. For example, for a nominal 8-in (200
mm) diameter loudspeaker, the baffle size would be 1.65
m long by 1.35
m wide, with the loudspeaker offset from the center by 22.5
cm lengthways and 15
cm widthways. If we have a rigorous model of the baffle, we can subtract its diffraction effects ...