You only really need to put the softest volume on headphones so that you can hear the beats..

nrjizer : Is the ringing in your ears from clubs or headphones?

If its from a club it wont permanently damage your ears that bad, unless you go to club more than 2 times a week @ around 4 hours.
How many days does the rining last for and how long do you spend at club/headphones?

___________________
http://www.rise.net.au/rise/images/picmerge.jpg