MM550 hissing sound... normal?
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operamatt

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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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