It's pretty standard mixing advice to mix on monitors that are as flat as possible (add no color of their own) but to test the final mix on car radios, headphon

It's pretty standard mixing advice to mix on monitors that are as flat as possible (add no color of their own) but to test the final mix on car radios, headphones etc to make some adjustments. Back in the day I checked out my nephew's Beats headphones and quite honestly thought they were broken because the bass on them was pumped up so much that it was a muddy mess. The mixer's job is getting harder and harder with the tradeoffs they have to make between phone speakers with no bass and vanity headphones with nothing but bass.