Have you looked at the Zvox sound bar available on Amazon. Uses hearing aid technology to filter out background noise. I have on on my TV which is the same as my Computer, seems to help. Other wise I use captions and ear buds which also work. Have to have a little pre-amp to use ear buds but works fine for those tough times. I found a refurb of the small unit got it pretty cheap from one of Amazons other deals. Zvox 200 here.
My hearing aid connects directly to the computer by bluetooth, which beats heck out of trying to use speakers, but still just not adequate for video sound tracks. I’ll look at the Zvox. Thanks.