@bob540 - I turned 70 in September, and I've had tinnitus for many years, and for me it manifests as a 'hiss'. Sometimes it's louder, sometimes it's quieter. It's possible that this is what you are experiencing. You might want to consult an audiologist....
Dang it, I'm Deaf....
The worse thing that can happen to an audiophile, I'm totally deaf (technically profoundly deaf) in one ear. It all happened in about one year's time. My retirement plans for getting a huge statement system are gone with my hearing. So, I went ahead and got a cochlear implant but it is not the same as a hearing aid, it's a last resort for those that have no hearing. I can't use it when listening to music. Fortunately, my other ear is pretty good. So I experimented with my system today. I ended up with both loudspeakers about 3 feet apart and sort of favoring my bad side. It's working out pretty good. I get some hints of depth but of course no wide soundstage. I'm also experimenting with mono vs stereo. I've had the music on for most of the day.I think I'll still be able to enjoy my music but in a slightly different presentation.
Anyway, I was wondering if anybody else with single sided hearing loss has any tips?