There was a big study done on it in 2019 with a blind test group using Ginko root (which is the "active" ingredient in Quietus which is crazy priced). I've researched it for several family members who have it, the most common is barometric tinnitus which kicks in as the weather/barometer changes. As far as audio equipment that might help, there was a study here using the Turtle Beach Hypersonic speaker system. I've had their headphones, but haven't tried those speakers.
HearingReview has a ton of current information too, there's always technology improvements coming out.
HearingReview has a ton of current information too, there's always technology improvements coming out.