One of the most overlooked aspects of the iPhone is its ability to playback uncompressed, CD quality audio. Apple has managed to squeeze even more quality and volume out of the tiny speakers on the newer iPhone3GS. Also, most people are unaware of the 3D positional sound feature incorporated into the original iPhone and what it actually does. This feature allows the developer to simulate moving sounds and have them play anywhere in three-dimensional space around the listener. For example, if a game developer needs to have a jet fly by the left side of the player, they can use the positional sound feature to place it there. Other devices can do this, but Apple makes it a lot easier for the developer.
Quality audio will enhance the user experience