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Is it normal to hear tapping on case with input unplugged and gain at max?

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asked May 27, 2023 in Revelator Series by waynedollery (120 points)
As the question suggests I have the Audiobox USB96 25th year edition.  I noticed this by chance.  I have NO cables plugged into the inputs.  Gain all the way up to max.  I can hear when I tap the case, almost like there is a microphone inside the case.  At about 2 clicks from max I suddenly hear white noise and the tapping sound heard through headphones pretty apparent.  3 clicks back from max it's still there but much less volume.

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