Testing the Apple iPhone 5 and how much the decibel (dB) level would get amplified. Tested with white noise using the White Noise App and measured with the Sound Meter application from a distance of 2 feet.
i5 : 71-72dBs
i5: with case trumpet closed: 74-75 dBs
i5: with case trumpet open: 82 dBs
10 dB difference!
US patented(2), CIP, & PCT