check the headphone specs, the higher "db" means more sensitive and more clear. you will find the price different from the sensitive index.
I am going to buy some new headphones and I can't choose a set. I do not want earbuds or on-ear phones, I am only considering ones that completely surround the ears. Also, I think I would like them to have a built in amplifier or be noise cancelling, but that is not a deal breaker. I tested Studio Beats by Dr. Dre and I was very impressed. That is the sound I would like but they are WAY out of my price range. I want the big bass and general "feel" of those phones but my price range is around $100 or less. I also tried Sony's XB500 and thought they were terrible. Please advise.