本期集中讨论了一些产品，并试图解答以下问题：
· 耳塞套能调音吗，参与调音的原理是什么；
· 各种材质和形状的声音特性如何，它们都适应哪些需求；
· 如何选购；
· 入耳式耳塞的佩戴与听力保护、耳道健康的关系；
涉及品牌：Etymotic Research / Azla / Comply / Spinfit / Sony（以及所谓「哥套」） / Sennheiser / Koss / Shure / Beyerdynamic / 铁三角（划掉）
BGM: Christopher Paul - Rubber Soul
#小朋友：vineland / 包雪龙 / KingTsui @RKTALLK
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