Replying to JBL Audio

So, I was looking at getting a single JBL cabinet for my dorm room they hit pretty hard, (better than anyone else's on campus, but I don't know what I am looking at and if I am going to need to get an amp with it too, or if i can just run it off of my auxiliary on whatever I hook it up to.
I am looking around $500 for the speaker and so far that looks like the JBL eon305 but I don't really know much with regards to this. Any help would be nice. Thanks.