[Teraflame]

It seems like I can't hear as well from my left ear compared to my right. It isn't noticeable normally but when I put on IEMs the vocals seem to come slightly to the right. There is also less detail/bass on the left side. Its not the headphones, I can swap L/R and it still sounds like this.

I just noticed it now having not owned IEMs/headphones in months. Any advice?

 

[aspenx]

I have similar symptoms with my other ear.

The best thing you can do for yourself first is to see a doctor IMO. An ENT specialist at least.

 

[Pianist]

This may actually be perfectly normal. My left ear also hears differently than my right and it seems like I hear less detail in that ear, but when I tested my hearing the audiologist said that my hearing ability is identical in both ears. This may have something to do with the differences between the brain hemispheres.

 

[Vikingatheart]

In all seriousness, it could be a buildup of wax in one ear. Not to say your other ear has none, but the other ear may have more. I am not saying this for sure, 'cause I can't see your ears , but it could be as simply as that.