Subwoofer Deals I Need Advice On Portable Speakers And Subwoofer For Outdoor Use?

I need advice on portable speakers and subwoofer for outdoor use? - subwoofer deals

OK, here's the deal: I'm going camping in a field with friends for my birthday, but I would kind of sound system to stream, such as mobile music from the iPod.
But I do not want anything from the garbage, the little speaker metal. I need this music is loud and with lots of bass. One of my friends recommended to get a subwoofer.
Has anyone any advice?