I’ve found that my tinnitus gets worse when I play loud music in my car, more so than the same level with a better set at home. So harmonics and distortion probably make a difference. I’ve tried wearing Calmer earplugs. These seem to help. The producer (Flare) has more customers with the same experience, but can’t explain the effect. In general, tinnitus is a neurological problem, so not something that can be fixed “mechanically” or on the “outside”. Improving your situation is therefore largely trial and error, see what works for you. For me, Harbeth works quite nicely. And vinyl.