#1
Does anyone know what this black, filter-like thing is that professionals put on the hold of their acoustic guitar? From what I can tell, it looks like some kind of filter that eliminates excess hum or something. Any help is appreciated. Thanks
#2
Do you mean "hole" (instead of "hold")?
Like the thing Jerry Cantrell is using in this video?

It's designed to eliminate feedback when you're playing an electroacoustic guitar through an amp.
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#5
It's just a soundhole cover mate. Plain and simple.
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#6
i've always heard it called a feedback buster.
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#7
^thats what I've always heard them called too.

It's just a chunk of rubber that fits into the hole. Plugging the hole dampens the acoustic guitars vibrations and reduces feedback.
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