I have no idea what category my question falls under so this seems as good as any. I’ve noticed hearing a sort of “distortion” on some songs in the bass area. Now, this distortion is there regardless of the equipment (cans, amp, etc.) used or the volume I listen to. It’s usually only in one channel but always the same channel for a given song. So some songs where this happens, it’s always in the right channel. On other songs it’s the left channel. I’m pretty confident this is not a problem with the equipment - again, multiple cans, amps, DACs, sources etc. It’s something in the recording. So my question is: what is this distortion? Is the dynamic range compressed during the recording process? Is it distortion in the mic or something else in the recording rig? Wtf is it?
For reference, you can hear it in this track starting at ~42 secs in the left channel: