When one envisions the iPhone the first things that comes to mind is elegance, simplicity and maybe accessories that cost too much. Even then the iPhone lacks in the audio department, the speaker is very weak which probably contradicts the speakerphone function but you can fix that for free.

TUAW tried this out and I can safely say this takes a ghetto Amp, demeans it some more then strips any value from it and turns it into something worthy of Macgyver. Behold, the iPhone cardboard Amp, may music blast throughout your room and break every window in your living room, your results will vary.

Via TUAW