Method of Computing Elements of Diaphragm-Type Transducers

The acoustical elements of transducers, such as apertures and air chambers, are computed in acoustical units. The acoustical impedance of each element may be written by inspection. These impedance values may be converted into “specific acoustical impedance” by multiplying by the first power of the diaphragm area. It will be shown that these values are mathematically compatible with the mechanical impedance of the diaphragm and mechanical compliance per unit of diaphragm area. It has been found that transducers having a given frequency response yield similar specific impedance values even though radically different in size and construction. Examples will be given. The use of cgs and mks units will be compared. Advantages of the above method will be demonstrated.