普通房间中辅助低频扬声器箱摆位的理论计算与实验对比

Comparison between Evaluation and Experiment for Placements of Subwoofer in a Normal Room

为了确定辅助低频扬声器箱在房间中较好的摆放位置,利用波动声学,在近似的情况下,对普通房间中的低频声场进行了分析.计算得出辅助低频扬声器箱在房间中的理论频响曲线,提出评价频响曲线的方法,即用曲线的方差来评价曲线是否平直,用此方法对房间中不同点的理论频响曲线进行比较,作出三维图.并且通过实验来验证,以期得到指导辅助低频扬声器箱在房间中摆位的方法.结果表明,本文对辅助低频扬声器箱在普通房间中的摆放,具有一定的指导意义.

Different placements of loudspeaker cabinet in normal room result in the difference of sound pressure distribution, even including that of the subwoofer. The best positions for loudspeaker boxes have been sought for many years. Some people consider the subwoofer's placement as unimportant, because the subwoofer is nondirectional. But in this paper, in order to find the better position of subwoofer in normal room, based on wave acoustics, the sound field of low frequency is analyzed approximatively. The theoretic frequency response curve of the subwoofer in normal room is calculated, and the method on the variance of the curve to appraise straightness of the frequency response curve is developed, according to which different spots in the normal room are compared, then mesh maps and contour maps are listed. Results of experiment validated the method, and a method for the better position of subwoofer in normal room is derived. It is indicated that this paper has directed value for place of subwoofer in a normal room.