Looking for the loudest portable speakers I can find

I am trying to find any speaker that I will be able to connect my phone that will be loud enough to play music on the beach or on a soccer field. The speakers needs to be powered by a battery of some sort also. I am curious if anything like this even exists?

Submitted May 30, 2015 at 02:44AM by FoamythePuppy http://ift.tt/1con8C9