Nothing, really, but you can use one to improve the other. If you find yourself in need of speakers, you can channel your inner MacGyver skills to fashion a makeshift set by poking your disposable earbuds into a paper cup. This helps direct sound waves without dispersing them too much. This can be a great little hack for those situations where you only have one set of earbuds but want to share a song with a friend (without sharing all that aforementioned earwax!)