Amplify the iPhone 4's Volume Without Power: the Griffin AirCurve Play

One of the simplest gadgets ever is also one of my favorites. I'm talking about Griffin's original AirCurve, the acoustically-shaped amplifier that docks and increases the iPod/iPhone's volume. It's now been updated for iPhone 4s, increasing music 10dB louder. » 11/10/10 5:20am 11/10/10 5:20am

Griffin AirCurve Dock Amplifies Your iPhone Speakers Without…

As I recall, there have been devices in the past that amplify the sound of portable devices using a system of channels as opposed to electronics, but the AirCurve from Griffin is designed specifically to work with the iPhone and the iPhone 3G. No power source is needed—the AirCurve directs sound from the iPhone… » 9/22/08 1:00pm 9/22/08 1:00pm