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502系统是美国BOSE公司1993年6月推入中国的一种新型的音箱系统。它的基本型是由两只中高频列阵音箱502A;一只无定位低音箱502B和一台系统控制器502C组成。 502A是一种特殊的音柱。它的特点为: (1)采用新设计的口径4.5英寸(11.4cm)宽频带纸盆杨声器组成列阵。五只扬声器轴向按排列顺序,从上到下,分别指向右斜上45°;左斜上45°;正面;右斜下45°和左斜下45°。音柱还向前凸起半弧(弧度0.27,折合约15°角)。这种安排继承了音柱指向性好,效率高的优点,又避免了传统直线音柱,声束过于集中,指向太尖锐,偏轴向外声压明显下降的缺点。使声波向所需要处散射,达到扩声区域内各处声压分布比较均匀的目的。 (2)中高频使用纸盆扬声器,避免了号筒引起的失真和听
502 system is a new type of speaker system put into China by American BOSE company in June 1993. Its basic model is composed of two medium and high frequency array loudspeakers 502A; a non-locating subwoofer 502B and a system controller 502C. 502A is a special fret. Its features are: (1) Array of newly designed 4.5-inch (11.4 cm) wide-width cone speakers. The five loudspeakers are arranged in axial order from top to bottom, respectively pointing to the right oblique 45 °, the left oblique 45 °, the front 45 ° and the right oblique 45 °. Column also raised half-arc forward (radian 0.27, equivalent to about 15 ° angle). This arrangement inherits the advantages of good directivity and high efficiency of the sound column, and avoids the disadvantages of the traditional linear sound column, the excessive concentration of the sound beam, the too sharp pointing, and the obvious decrease of the sound pressure outwardly on the off-axis. So that the sound waves scattered to the required place, reaching the sound reinforcement area throughout the sound pressure distribution more uniform purpose. (2) High-frequency use of cone speakers, to avoid the distortion caused by the horn and listen