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Sound Quality has dropped randomly

This question relates to connecting a Cowin E7 BUY NOW to an Apple iPhone 6 BUY NOW

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Recently he sound quality of my headphones has been fine going at full volume fine, however randomly today the sound quality has dropped by half, when I reset the headphones and reconnect them to my phones the headphone volume drops to half way and then apparently displays as full volume, it's meant to be sound cancelling but for some reason on busses I can barely hear it.
Question by Daniel 12:22pm, 21st July 2017

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Admin responded : 7:17pm, 22nd July 2017 (4 years ago)
So the button on the side is set to NC? And if whilst listening to music you slide this between positions do you hear a difference?

To check the volume issue, is there a difference changing the volume via the iphone or the speakers ?

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