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MM550 hissing sound... normal?

  1. operamatt
    so I just received my package with the mm550's and am now giving it some attention

    the problem is when I deactivate the noise cancellation a constant hissing noise takes center stage in the left earcup only.

    I assume it's Bluetooth interferences but I just want some confirmation on whether this is a normalcy with this headphone in particular
    thanks head-fi
     

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