By varying the groove spacing, the diameter of the single or double diameter hole, and the rear air cavity depth and content, one can obtain absorption over a wide variety of frequencies.
通过改变槽间距，直径的单人或双人直径孔，与后方空气腔的深度和内容，就可以得到吸收超过各种各样的频率。
However we did little on the parameters such as groove width, depth, spacing. shape and direction, and there is no these requirements in our technical specifications.
但是对刻槽诸参数(槽宽、槽深、槽间间距、槽型和槽走向)缺乏研究，规范上无明确规定。
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