I don't know how better to describe it than that. All audio on my computer, when played through a headset, sounds off. Either it has a faint "underwater" sound or some other distortions. Voices will be too quiet and echo, while background audio will be loud and jarring. I've used several different headsets, and tested them on different devices, and they seem to look fine. I've used them directly in the computer's audio out, which I thought was the problem, but I've also tried using USB headphones, and using my phone and it's USB as a third party. And even odder, things seem to sound fine when played through the computer's speakers. I could be wrong about that one and just not noticing, but it seems alright.
I'm on an Acer Aspire 7551, and this sound issue seems new. Like I said, I thought the issue was the port, and that could be an unrelated problem, but it's even giving me trouble through USB ports which are fine otherwise.