It’s a fact that human ear can only tolerate so much sound.  Sound waves that enter the ear cause the tympanic membrane (also known as the eardrum) to vibrate. Humans are capable of hearing sounds waves with frequencies between 20 and 20,000 Hz. The three bones inside the human ear (called the malleus, incus, stapes) send these vibrations on to the cochlea, which is a snail-shaped structure filled with fluid that is located in the inner ear. All of this we tend to take for granted, hardly knowing or really caring how it works.  And yet, there are certain things it is important to know about the ear, to avoid damage caused by sounds that can actually harm your hearing, or even destroy it over time.  

This is true especially as it applies to your sound system, whether in your car or your home.  If you know how much your ears can withstand of any kind of sound, you are less likely to suffer hearing loss or permanent hearing damage.  Check out this great infographic that illustrates the science of sound and human hearing.  Thanks Fixr.com.