stereophile magazine says for 2014 the audioquest  dragonfly v1.2 usb dac is the best entry level one. dacs give headphones a better balance of bass treble and etc.

i just got my new pair of takstar hi2050 headphones in the mail on december the 1st. they were suppoused to get to me from dec the 5th to dec the 19th. so they came early.  they were only 54 us dollars brand new on ebay with free shipping. it's the  best deal i've seen for something that is hi...