Headphones with equalizer so my dad can watch movies again?

My dad is going deaf and also has hyperacusis. He really likes listening to music and watching movies, but since movies have a tendency to increase/decrease in sound and frequency very rapidly, he has to take his headphones on and off every three minutes. (headphones as in those ones that link to tvs specifically- he's an old man).

Does anyone know of headphones that could cut the sound off at a certain volume, and/or ones with an audio equalizer? High pitched sounds really bother him, as they're ones he can hear quite well.

If anyone has any other product tips, I'd love them. I noticed you guys have quiet tips as well, which I don't need, but I can give: we've used plastic plates for years. No clinking silverware on plates.

Hope yall are having a lovely Christmas!