Evaluation of Non-linear Distortion in Compression Chamber of a Low Frequency Horn
* Presenting author
The subject of the paper is study of non-linear behaviour of air in horn-loaded low frequency speaker devices. Research and development of low frequency transducers lead to improvement their linearity of excursion trough linearization of suspension compliance and BL-factor as well as steadily increasing thermal power handling. The use of those latest transducers promises to achieve unprecedented efficiency and sound pressure levels, especially when combined with high compression horn-loading. The limiting factor in this case is nonlinearity of the air, which is particularly high in compression chamber. The volume of this chamber changes during operation of loudspeaker even by several dozen percent. This paper gives an insight on the influence of nonlinear compliance on nonlinear properties of loudspeaker through analyse and measurement of a prototype horn-loaded low-frequency loudspeaker device. As the driver an ultra-linear woofer has been applied. To evaluate the participation of the horn and compression chamber in total nonlinearity of the device, the measurement of the device with and without horn-loading have been done.