Took my a2 speakers to Nepal, they got played 20 hours a day by random mp3 players, possibly some outputting clipped signal running full volume on the mp3/speakers, this was an outdoor setting. On the last day of the trip they gave up, one of the cones has a tear.
Luckily audio engine has a great customer service, bajaao is replacing them.
These speakers are not like Logitech speakers which I've seen don't sound half as good but can sure take some abuse.