I'm trying to think about what i have done so far, many track of mine sound really pleasant on most high quality headphones and speakers but then sound really ........low end lacking on some cheap average earbuds.......although the listening is still enjoyable but at high volume, its pain to ear...to smartphone folks...

Maybe i put my mixing faith too much on my AKG-K240 and too modest on low end factor?

Oh yeah, remind me, now i really hate most bass presets on Sylenth1, Dune.

mistake learned, have so much things to do in this year!