clinical study by none other than the U.S. Veterans Administration to be literally twice as effective as any other therapy sound in the study. 'Tinnitus-Minus' consists of special sound waveforms that are produced by a small ultra-high accuracy speaker. Our unique sound therapy is highly effective at suppressing the disturbing noises, enabling people to regain their normal lives. If you have tinnitus, and are looking for an affordable but legitimate FDA-cleared and clinically studied solution, Tinnitus-Minus is the answer.