The speaker in an iPhone is pretty puny, so people have come up with all sorts of ways to boost its output. Few however will dominate your room quite as effectively as this giant acoustic speaker horn.
The Megaphone takes the feeble output from the iPhone's built in speaker, and amplifies it in much the same way as cupping your hands around your mouth when you want to yell. Best of all, the process is entirely passive, and doesn't require any external power.
With prices starting at around $540, The Megaphone is really for someone who wants a giant horn as some kind of artistic statement in their house. If you just want good sound, there are several far more effective iPhone dock solutions you could go with for that kind of money.