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Neck positioning maybe? Do you grind your teeth... does your T show any somatic symptoms.
I have a feeling too that my head position changes the sound...
I don't grind my teeth that I know of. I might try a dental biteguard anyway. My T is somatic yes, it changes with extreme neck movements. But I remember reading that something like 70 percent of people with tinnitus have that regardless of the cause.
oh man... if yours is heavily influenced, maybe you should try a splint or therapy for your neck mayhaps.