What determines headset/headphone quality?

1. About the headphone for your lcd touch display screen smart phone

   Generally, the larger the range of frequency response, the better.
   But, for example. You may have one beat headphone that has a frequency responce from 50hz to 16khz
   and then a headset which are from 30hz to 22khz. But, the headset at 30hz may actually start rolling off around 65hz and 15khz, wereas the previous one may not start to rolloff untill it’s specified figures.
   
   
   
   The lower the ohms the easier it is to drive the headphones, if your using a PC to drive your headphones you would normally want less then 120Ohms, after this a headamp is reccomended.
   40ohms and lower will work OK off a portable device.
   The higher the input power, e.g. good beat headphones (expensive, too) are usually 1000mw or higher, so they accept and use more power and stay cleaner and go louder.
   But to be honest, headphones sound entirely different to each other depending on the diaphram, size of the driver (the speaker) 4cm and above offer the best amounts of bass. But you will still find 53mm drivers with hardly any bass.
   Unfortunately for you it is not as clean cut as looking at the specs, infact when you get to higher end headphones people ignore them, they just listen to them and buy a beats headphone amp.

   When enjoy your music by your touch display screen smart phone , Mp4/Mp3 with a good quality beats headphone is really wonderful.