Ported Bass-Reflex Enclosure
管状低音反射腔
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The bass-reflex enclosure makes use of a tuned port which projects some of the sound energy from the back of the loudspeaker, energy which is lost in a sealed enclosure. But care must be taken to avoid the back-to-front cancelation of low frequencies which characterizes unenclosed loudspeakers. This is avoided by tuning the cavity resonant frequency of the enclosure to the free-cone resonant frequency of the loudspeaker. This has the effect of projecting bass frequencies from the port in phase with the sound from the front of the cone, at least at the resonant frequency. The overall effect is the increasing of bass efficiency and the extension of the bass response to lower frequencies.
低音反射腔利用一个调谐的消声孔，将一部分声能从扬声器后方辐射出去，而这种声能在密封腔体中会损失掉。但必须注意避免低频的前后抵消现象，这正是无腔体扬声器的特征。这通过将腔体的共振频率调谐到扬声器自由锥体的共振频率来实现。这使得在共振频率下，低音频率通过消声孔与扬声器前方的声波相位一致。总体效果是提高了低音效率，并将低音响应延伸到更低的频率。 |
| Effect on loudspeaker resonance
对扬声器共振的影响 |
Loudspeaker concepts
索引扬声器概念
| HyperPhysics***** Sound
HyperPhysics ***** 声音 | R Nave |
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