直接辐射式扬声器系统的低频效率计算公式*

效率是扬声器系统的重要性能指标，然而常用的标称效率在低频范围并不适用。本文研究直接辐射式扬声器系统的低频效率，推导了基于TS参数的低频效率计算公式。针对封闭式扬声器系统和倒相式扬声器系统，开展实验验证，结果表明本文提出的计算公式得到的低频效率与实验测量得到的低频效率较为相符。进一步对比分析低频效率和标称效率，结果表明低频效率能够适用于低频，能准确地展示扬声器系统参数对效率的影响。利用本文提出的计算公式，有助于进一步优化提升扬声器系统的低频效率。

Calculation formula of low frequency efficiency of direct radiation loudspeaker system

Efficiency is an important performance index of loudspeaker system, while the commonly used nominal efficiency is not applicable in the low frequency range. This paper discusses the low frequency efficiency of direct radiation loudspeaker system and deduces the calculation formula of low frequency efficiency based on TS parameters. Experimental verification is carried out for closed loudspeaker system and vented loudspeaker system. The results show that the low frequency efficiency obtained by the calculation formula proposed in this paper is in good agreement with the low-frequency efficiency measured by experiment. The results show that the low-frequency efficiency can be applied to low-frequency and can accurately show the influence of loudspeaker system parameters on efficiency. The calculation formula proposed in this paper is helpful to further optimize and improve the low-frequency efficiency of the loudspeaker system.