You can use any DAC without an amp, what determines the need for an amp is the headphones you are using. If you are trying to drive high impedance headphones than you will want an amp to get the best sound out of it. If you can, try connecting to an amp and see if the sound quality and volume is better than when it is connected to the DAC alone. If it is then you need an amp, if not then you don't need one. Hope that helps.