I'm in my mid-50's and have problems hearing certain frequencies clearly and a touch of tinnitus in my right ear

The bass overwhelms in most music types and even throttling down the lower frequencies using an equalizer (Spotify on iOS has one, for example) only turned the bass down a bit... it was still overwhelming and lowering the bass altered the sound stage and made the song sound strange

I have high frequency hearing loss and I needed help to understand speech in TV movies.

With high frequency hearing loss, as I turn up the volume speech gets "bass heavy" with the less expensive models

[I have some diminished low and high frequency hearing loss -- as people age, they naturally lose increasing amounts of high frequency sensitivity, which makes distinguishing some consonants - like b,c,d,f,p,s,t for example - difficult, thus making speech intelligibility problematic, especially in the presence of background noise or foreign accents].

A simple twist of a switch on the "cradle" for the headphones puts out the frequencies required to understand the words (generally, a one-time setting requirement), and a push button on either the cradle or the headphones kills the background noise when required.