| 摘要 |
The present invention relates to a loudspeaker device, comprising first and second closely located and individually acoustically isolated loudspeaker elements. The first and second elements are arranged to receive a first signal and a second signal, respectively, at least part of said first signal being in anti-phase relative to said second signal. The device further includes third and fourth loudspeaker elements, being located in close proximity to said first and second loudspeaker elements, respectively. The centre of said third loudspeaker element is located such that a first axis intersecting the centre of said first loudspeaker element and the centre of said third loudspeaker element is inclined an angle f relative to a horizontal plane, f being in the range 0° - + 30°, and the centre of said fourth loudspeaker element is located such that a second axis intersecting the centre of said second loudspeaker element and the centre of said fourth loudspeaker element is inclined at an angle cp relative to a horizontal plane, f being 0° - ± 30°. The first and second signals to said third and fourth loudspeaker elements, respectively, are low-pass filtered, the cut-off frequency of said low-pass filters being less than or equal to 2.5 kHz. |
