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It can’t be tinnitus because there is no hiss when the headphones are in and the noise cancellation is off. As soon as I turn it on, the hiss is there. If I switch to Transparency mode, audible hiss, take out the left headphone, can hear the hiss in the right, turn off the noise cancellation it’s gone.
Maybe my hearing is too sensitive or something, but it’s a clearly white noise from the noise cancellation, like I can literally hear it fade in and out as I switch between the modes on my ipad.
Could be faulty. No hiss on mine or any other ANC earphones / headphones I have.
Are you sure you don’t have tinnitus or something?