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Earphone cracked open, noise cancelling makes high pitch sound now.

Earphone cracked open, noise cancelling makes high pitch sound now.
Need to find a way to fix the earphone noise cancelling function so it doesnt sound like a high pitch sound.

ANSWERS:

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The air leak in the ear chamber creates this problem. Seal casing with a silicone glue. While in cancellation noise mode, block the ear bud. It will make a shrilling sound. With your other hand, sandwich the casing. The sound will disappear because your ear chamber is air tight.

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