Hey ptss,
Depends how fine a control you want. The Shiit Loki gets high marks around here. If you want much better control, like in the 1/2 octave or better range consider a miniDSP as a very flexible option but it does have a learning curve.
While you will get naysayers, if you have hearing loss an EQ is a thousand times better than not having one to ensure you keep enjoying music.
You could also consider a speaker brand like Dali's which have pretty beefed up treble to begin with.