Have this DAC purchased to bypass the onboard sound output of my laptop and to get a clean signal. In addition to a 250 Ohm headphones can be fired. The Fiio is just as big as a matchbox and requires no additional power other than USB. Good like the processing and optional bass boost switch, which raises the depths of 3 dB. A total of E10k achieved quite a linear frequency response and offers a lot for the money line. - Buy recommendation.