[問題] 請教水管上音箱的問題
為什麼單體前面還要接麥克風?作用是什麼?
另外有時會看到表演者戴耳機?他在聽什麼?
http://www.youtube.com/watch?v=qFbApplWABU
麻煩解惑一下謝謝。
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