Alpatronix AX100 Ultra-Portable Mini Capsule Speaker with Enhanced Bass & 3.5mm Audio Jack for Apple iPhone, iPad, iPod, Samsung Galaxy, Nexus, HTC, Blackberry, Nokia, Smartphones, MP3/MP4 Players, Tablet, PC, Laptop [Retail Packaging - Rechargeable Battery, Carrying Pouch & miniUSB Cable] - (White)
This is an amazing speaker for the size and price, but will not go as loud as I hoped.  Any external speaker should be louder than my tablet, but this one will only go about the same.  The quality is a little better than the tablet, with more bass and clearer tones, but I was hoping for more.