You know that human only have limited number of hair cells. And if you use some region extensively, eventually they will be worn off.
Hence, two years ago I find my HD800 a bit hot on many pop and rock songs.Now, I I just think it is fine and there is no sonic energy cause my ear pain anymore.
Some say it is because it got burned in, some say it is because my music source is getter better. I just think, my ear has been ruining already so I will have the same hearing ability as those sennheiser sound engineers who will be old and probably half deaf already~~~
The hair cells (cilia) deteriorate as we age and can be damaged by exposure to loud noise, but it is not true that they get "worn off" by exposure to specific frequencies.
Now ringing of the ears (tinnitus) is another story. It is still somewhat unknown what causes tinnitus - some believe it is damaged cilia that are in a constant state of excitement, while others believe it is completely in the cerebral cortex (read about neuroplasticity). Some believe it is a combination of both. Neuroplasticity not only explains how the brain compensates for hearing loss and creates tinnitus, it also xplains why "burn in" occurs and headphones that sound bright when you get them sound better over time.
There is a lot more to it, but its fascinating reading; reading that may help you stop spending money on "better gear" and also help you protect your hearing.
Edited by palmfish - 2/9/14 at 9:18am