Well to answer your question, I don't know of any specifically known issue of the speaker crackling at max volume, but there are various ways in which it could based on the source material being played. Reason I asked you how it sounds on everything else is you mentioned one particular video, but didn't state it does it in anything else. So to really know if it's just an isolated case or if it's apparent in all media you play on your phone I needed to know. For me personally, there are times the speaker will slightly distort but typically it's very good at maximum volume, no crackling sounds.
