Most iPod docks aren't much bigger than the music players that plug into them. The Wall of Sound isn't most iPod docks. This behemoth is 3' x 4', full of 28 speaker elements. Yeah, it's pretty big.
This monster will set you back an equally-large $4,500. It weighs 225 pounds, so you'll need some help placing it in your house. But hey, if you want a speaker that just looks straight-up impressive when people come over, this will certainly do the trick.