主動喇叭的電源孔 - 喇叭

入手了一對elac air x主動喇叭，翻手冊的時候有句話看的不是很懂，還請知道的大大賜
教。

手冊圖如下
http://tinyurl.com/k2s4ued

原文如下，phase我查到的是相位，但跟電源有關聯？
Phase: Selecting the correct mains phase can lead to a significant improvement
in sound quality.
Make sure that the live pole in your mains supply is connected to the left pol
e of the mains socket
(marked here by a red dot). If in doubt, consult a qualified electrician.


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