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Monster Beats Pro Over-ear Headphone Review$449.95
The Monster Beats Pros are bad isolators. They don't have any active noise cancellation, which is fine, but you're not likely to block out the outside world with these headphones. As you can see in our chart, it blocks out almost no bass frequencies, and really doesn't start dampening sound from outside the headphones until about 900Hz. Even then, it never really blocks out much sound.
The Monster Beats Pro leak sound like a sieve, and consequently if you bring these to a library, tennis match or church, you are liable to be tossed out fairly quickly. Be very wary of your situation when you listen to these headphones, as you may end up offending someone with your music, or worse: revealing your predilection for the complete discography of Hannah Montana.
Maximum Usable Volume
The Monster Beats Pro have a maximum usable volume of 118.395dB, which means that at this volume, distortion crosses the 3% threshold and makes your music (if it didn't already) sound terrible. This isn't a bad showing, and by all rights nobody should really be listening to their headphones at that level, as it's dangerously close to the 120dB threshold where you can start to get permanent hearing loss.