Your ears are very delicate and exposure to excessively loud music can cause irreversible damage.
Prolonged exposure to sound pressure levels above 85dBA will cause damage to your hearing. If you have ever been to a party or to a concert where loud music was played, you may have experienced Temporary Threshold Shift (TTS). This temporary loss of hearing can become permanent if exposure is done on a regular basis.
There's an easy way to tell if you've been exposed to excessive sound pressure levels. You tend to hear a ringing in your ears. Remember, it is your high frequency hearing that deteriorates first. Think of what music would sound like if you coudn't hear anything above 10KHz. Protect yourself or just turn it down!
If you wish to find out how loud your system is playing, get a sound pressure level meter. You could buy one (US$32 at Radio Shack) or check your local dealer. He may have one and may even check your level for free.
Portions of this page have been taken from The Installation Doctor published by Crutchfield
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