Even excitation of room modes is prerequisite to a balanced low frequency transfer characteristic. The spatially distribution of low frequency sources in multi channel systems yields complex mode excitation patterns. The positioning and adjustment of the relative phase of the main speakers to a “single” LFE is addressed in order to achieve a good summation. Finally, large listening areas combined with a well-balanced transfer characteristic are expected in modern multi channel applications. This study presents solutions by means of using multiple low frequency cardioids to improve the room transfer characteristic. Of particular interest are possible consequences on the decay times of individual modes as well as the signal summation of LFE and main speakers. Further investigations relate to the number of low frequency cardioids and how they relate to the spatial variation of the transfer characteristic in the room.
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