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NC 700 Ringing noise on the right

I have a weird problem with my NC 700: On the right side, there is a (sometimes) ringing noise (high pitch) and a rattling noise when high volume/low frequencies.

According to my observations: The ringing only occurs when ANC is enabled (independent of the amount of ANC). The rattling is independent of the ANC.

The ringing is only heard when the headphones are worn (or when I close the cup with my hand). The rattling is only there. Sometimes I can fix the ringing and rattling completely (weirdly until I shutdown the headphones) by hitting/tapping the right ear cup with my hand.

I'm aware of the dust-in-outer-microphones and I have used canned air to clean them. But it makes no difference.

I have disassembled the right cup to check if there is a particle on the driver or something but could not find anything. I suspect that there is something wrong with the microphone in front of the drivers, as this microphone is probably to filter feedback and my issue seems to be feedback(?). The PCB is not very well attached to the holder, only the glue on the MEMS mic (?) keeps it in place.

Are there any hints? I suspect some physical problem as tapping seems to fix things?

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This is a feedback problem.

There is a seal issue in between the outer microphones used for Noise Cancelation and the Speaker. Therefore, that ringing sound is feedback from what the outer microphones are picking up from the speaker.

I do not have this model of headphones, and therefore I cannot be of much help. But try this: check to see if there are any broken seals next to the outer microphones and the speaker. See if that helps.

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Hey thank you very much for your answer. I could not find a broken seal. There are some rubbery seals. I put some tape over them but it did not change.

However. I replaced the whole speaker unit with a spare one and this fixed everything.

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@bosenc700r20833 - That's good! I'm glad you got it fixed. Unfortunately sometimes that is the only way to fix something: by replacing the component.

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Bose NC 700 Ringing zal eeuwig dankbaar zijn.
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