Apple acousticians re-engineered an earbud speaker diaphragm with both rigid and flexible materials to minimize sound loss and maximize sound output. Adding to the superior audio quality are strategically placed acoustic vents. The most notable of these vents is the one located in the stem of each EarPod. It allows air inside the stem, which acts as an acoustic chamber, to flow out. So you hear deeper, richer bass tones.
振膜用複合材料，以及開孔，這二項大家都很熟悉。
我倒是對正面開了二個孔這點比較有興趣...
相當特殊，Apple卻完全沒提...嗯...或許正在申請專利中...
這段video值得一看
http://www.apple.com/iphone/design/#video
倘若Apple認真做喇叭呢？
嘿嘿...
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