So I recently bought an IEM (Sennheiser IE200) because wearing a headset for long periods of time began to give me headaches and I have this weird problem where all sorts of voices and some sound/menu effects are super muted, just very quiet random, metallic sounding gibberish in the background, but the music and ambient sounds are loud and crisp.

Bear in mind that my knowledge in the Hifi world other than plugging a headset into a USB port is basically zero, but I connected the IEM to the front headphone jack of my PC, Windows asked me what device I plugged in and I chose ‘headphones’.

The voices which I tested that are affected:

-all videos on YT, etc
-unit selection sounds in RTS games and old RPG like Baldurs Gate
-noises due to becoming aware of the player/death screams in Souls games

I’d appreciate any help guys.