Hi guys, The brother of a friend of mine is a DJ at a night club and he has a pair of headphone that he would like to sell. According to him, the phone is only been used for about a year and he is willing to sell it at a discount to me. My questions... what can possible go wrong with a...

Hi, I am new to the world of headphone amps. I've noticed that many of you said "burning-in" before using the amp, what exactly do you do there ? Just hook up the amp and play music for 200-400 hours ?? Or is there some sort a frequency generator ( or a recorded CD ) ?? Thanks Ted