Measurements

On the iPhone 5, the incoming voice drops in and out. The wave forms of the recordings clearly show low volume sounds are muted on the iPhone 5. The iPhone 4 does not have this problem, in call quality it beats the iPhone 5 hands down.

The iPhone 5 completely mutes the lower volume sound bites. This hurts the intelligibility a lot.

On the iPhone 4 the lower volume sound bites are still there. The intelligibility is great.

Combining the images clearly shows the difference. The iPhone 5 (green) has less audio information then the iPhone 4 (red).

The images show the first 5 seconds of the interview that is played back in the YouTube video.