@valeri i have the same problem. In the beginning (first months) I didn't have issues with low frequency noises. Now a car drive, planes etc make it spike. The sound that i perceive is beyond imagination. It's deep, fills all my head and also has a sensation of vibration. Plugs do not work at all. I also had an extra worsening after 2 boat trips. I am afraid that i have to quit car drives forever which as you understand is almost impossible. What I wanted to ask you is if you feel your hearing dropped due to this low frequency sound. This part of my tinnitus consists of approximately 200hz + 400hz tones. Apart from my ringing.
Is your tinnitus low frequency or high pitch?