N2 - The non linearities in the motor of an electrodynamic loudspeaker are still a discussed topic. This paper studies the influence of the force factor variation with the coil displacement on the harmonic and inter-modulation distortions. The real variation is described at least by a linear and a quadratic term. The effect of each term is studied separately, as they don't influence the same kind of frequencies, harmonics or inter-modulation. Both terms considered together result in enhanced effects. The dissymmetry of the Bl variation with regard to the coil centered position has also peculiar effects. This paper presents the method developed to calculate the power of each harmonic and inter-modulation frequency. This allows to compare the obtained values and thus the induced nonlinearities. L1 - http://www.journals.pan.pl/Content/104449/PDF/13_paper.pdf L2 - http://www.journals.pan.pl/Content/104449 PY - 2011 IS - No 4 EP - 885 DO - 10.2478/v10168-011-0058-0 KW - electodynamic loudspeaker KW - non linearity KW - force factor A1 - Erza, Mehran A1 - Lemarquand, Valérie A1 - Lemarquand, Guy PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 36 DA - 2011 T1 - Distortion in Electrodynamic Loudspeakers Caused by Force Factor Variations SP - 873 UR - http://www.journals.pan.pl/dlibra/publication/edition/104449 T2 - Archives of Acoustics