I've produced tracks that sound incredible to me on my 6" Yamaha monitors. Then I send them over to friends who listen to them on their tinny laptop speakers and wonder what the big deal is.
Studios deliberately use bad speakers (NS10s, Auratones) to check for this.
In the business it's called "translation" - a good mix sounds good on everything from earbuds to a car stereo to $$$$$$ hifi.
It's almost impossible to make a mix that translates without spending a lot of money on neutral monitors and acoustic treatment.
But there are tricks you can use to make a mix translate better. E.g. You can cut the lowest octave or two in the bass, because no one (outside of a club) can hear it anyway, and use bass sounds with plenty of mids, so you can hear the line even when the low bass isn't there.
Someday I hope to be experienced enough to just know what to do though, without all the extra work. I haven't found a systematic answer yet.