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TPA3130D2: 雙聲道輸出, 但一聲道正常, 一聲道有不明噪音

Part Number: TPA3130D2

使用TPA3130D2作PA, 

電路幾乎都照SPEC建議設計,

但左聲道會有奇怪的聲音 (無法形容, 請聽附件), 

而另一聲道則完全正常, 並且音質很乾淨,

可以協助看看哪裡有可能出問題嗎?

NOISE.m4a