@deep_333 - I've got a headphone system in addition to a 2-channel one, and there's no reason headphones should cause any more hearing damage than speakers. Blast 'em over long periods and you can damage your hearing. Don't and you should be good. Isn't 80db 80db no matter the transducer?
Large venues with bad PA's and high distortion that leave your ears ringing afterwards 100% can damage your hearing.

