Siemens signia hearing aid dealers. Signia hearing aids offer three different strategies against tinnitus. Static noise and ocean wave tinnitus therapy cover up the disturbing tinnitus sounds with individually tuned therapy signals, as a result we can relax and concentrate on what we want to hear. Third one is the notch therapy , which can reduce the effects of tinnitus and may even make it disappear completely .Signia hearing aids are the only ones with in-built Notch therapy.