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urgent feedback needed about sennheiser mm450x

post #1 of 2
Thread Starter 

hello everyone

 

I bought the mm450x and I feel that when I turn on the noise cancellation the base in the left ear starts to sound bad, did anyone else notice that or is my unit defect .

 

I argued a lot with their agent and they say nothing is wrong with it. They don't want to return it or replace it, how can I solve this issue

post #2 of 2
Return them on warranty, mine doesn't do that, no headphone should!
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