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上期的PART Ⅰ笔者题之为“从EPR……谈起”,但仅仅是“谈起”。虽然文中已经对EPR版式中的某些影响因素作了一些补充说明,但只是提了个头,明眼人马上就能指出:PART Ⅰ对EPR算式(Ⅰ-2)中最关重要的,即所需要的SPL值倒底多大并没有作出明确的解释。而此SPL值,或者说距离D_2位置,为了达到既定功能的要求,声电系统设计不单能提供D_2点的声衰减这样一种相对增益,而且还能提供D_2点的绝对值电平概念的“最佳”直达声
PART Ⅰ of the previous issue of the author entitled “from EPR ... talk about”, but only “talked about.” Although some of the influencing factors in the EPR layout have been supplemented in the text, only the brief introduction is given to the discerning eye, and immediately it can be pointed out that PART I is most important to the EPR formula (I-2) SPL value down and how much did not make a clear explanation. The SPL value, or the distance D_2 position, in order to achieve the desired function requirements, acoustic system design can not only provide a D 2 point sound attenuation such a relative gain, but also to provide D_2 point absolute value of the concept of “ Best ”direct sound