One jack audio output misbehaving, call mode?

My computer (tower) has 3 audio outputs : a front jack, a back jack, and bluetooth.

The back jack and bluetooth work fine, but when I use the front jack (regardless of the headset and jack cord), I have the same kind of audio quality you have on calls : very degraded, and some parts (frequency bands ? I guess) almost don’t come out.

I’ve had issues soon before, with my computer not hearing anything from my webcam’s microphone (though the image worked fine). So I have a hunch it could be some kind of driver/software-ish problem.

The problem resolving utility of Windows was extremely unhelpful. I’m on Win11.

What does this look like ? What are the things I should try ?