Analysis of electro-mechano-acoustical circuits

The loudspeaker motor is composed of a magnetic circuit which creates a magnetic field B in which is placed a coil of length , of resistance and electrical inductance .

The electro-mechanical transduction is characterized by the force factor .

The mechanical part can be represented by associating an mass , corresponding to the mass of the mobile part (membrane + coil + suspension), of a mechanical compliance corresponding to the elastic suspension, and a mechanical resistance which expresses the totality of the mechanical losses of the system (friction in the air gap, losses in the suspensions, etc.).

The loudspeaker radiates into an infinite space thanks to its two faces. Each of these two face, of surface

is thus loaded by an acoustic radiation impedance .