Every mixer I ever met did 2 things. 1. Played the mix on a cheap cellphone (this used to be a boombox or 80s wire loop headphones), and a bad car stereo or 2.

Every mixer I ever met did 2 things. 1. Played the mix on a cheap cellphone (this used to be a boombox or 80s wire loop headphones), and a bad car stereo or 2. Listened on Car stereos, as they have whack eqs and soundstage, and will bring out any hint of ugly. Tiny speakers will distort readily, and pop music must sitll sound decent when abused, because omg ppl abuse it. For a club track, you optimise differently, but err on the side of sounding good on crappy radio speakers always otherwise.