this is the correct answer. ear fatiguing is often caused by incorrect EQ settings in your system. using too much of a high-frequency band and you’ll initially get a brighter and better sound, but you’ll soon start to get fatiguing and even headaches.

Radio songs are heavily post-produced by the radio itself, strictly limited in dynamic range and they also have a mastering EQ that provides a bass boost.

I’d suggest OP to check their EQ settings and aim for a more neutral sound.