When does speaker distortion become audible?

I recently got some seas excel speakers and when I fired them up for the first time I thought to myself "wow, there's no distortion".

I find this interesting because I never really thought I was hearing any distortion from my previous speakers but maybe I was, and just didn't pick up on it until now.

Interesting side note, I think my personal speaker taste is moving towards less analytical, super detailed sound to a more musical, tone based preference (I think I'm becoming less tone deaf, lol).