Abstract: Presented is a surround sound system including a loudspeaker enclosure containing a left speaker, a right speaker, and a center speaker. The speakers receive separate audio signals previously processed by a channel decoder. A virtualizer performs a head related transfer function (HRTF) on at least two audio channels. First and second summers respectively combine a front L signal with a post-HRTF L signal, and a front R signal with post-HRTF R signal. The respective combined front L and front R signals are then provided through respective amplifiers to the front L speaker and the front R speaker so as to produce front and rear signals. In another aspect, a loudspeaker enclosure contains first and second left speakers, first and second right speakers, and a center speaker. Wherein the second left speaker and the second right speaker receive respective left surround and right surround post-HRTF virtualizer audio signals.

Abstract: The present invention comprises an L channel speaker unit which produces an L channel signal; a R channel speaker unit which produces a R channel signal; and a center speaker unit which is placed between the L channel speaker unit and the R channel speaker unit and which produces a −L channel signal and a −R channel signal. For speakers mounted in an automobile described above, the L channel speaker unit and the R channel speaker unit are placed in the front center of the driver seat and passenger seat of an automobile, and the horizontal vibration axis is in a direction pivoting in a direction from the direction of motion of the automobile, and a vertical vibration axis is at a prescribed angle incline in the direction of motion of the automobile.