(Original photography from pickywallpapers.com, photoshopping by Mike Wehner)
You can always tell when it's the day after a big Apple news day, because we end up writing and publishing stories like this... iClarified (via Cult of Mac) recently updated their sound level test for iPhones to add the iPhone 5c, 5s, 6 and 6 Plus. The results will come as no surprise to anyone who owns one of the two newest iPhones - the iPhone 6 is the loudest, at 105.4dBA while the iPhone 6 Plus comes in second at 105.0dBA.
The iClarified team found that the iPhone 6 is 10.1dBA louder than the original 2G iPhone. Sound measurements are logarithmic, so that means that the iPhone 6 is about twice as loud than the first iPhone.
So, how loud is that iPhone 6 when you have the speaker volume cranked to the max? That's almost as loud as a power mower three feet away, and louder than a snowmobile. NIOSH (National Institute for Occupational Safety and Health) guidelines say that you should be exposed to 100dBA sound levels for less than 15 minutes each day.
The moral of the story? Don't crank that iPhone 6 or 6 Plus speaker up to the top level as it can adversely affect your hearing.
For your edification, and to keep you from having to read even more articles about Apple's amazing Q1 2015, here's iClarified's video about capturing the sound level readings. Note that the location of the decibel meter varies depending on where the speaker is located on a particular model of iPhone.