You can use your computers internal DAC, but if you are going to invest in this killer amp, it will reviel the shortcomings of your laptops onboard DAC. Are you planning to go fully balanced to your cans? If so, you'd benefit from a DAC that can support that, such as the SDAC-B here on Drop, of the Topping 30 or 50, or the brand new SMSL M200 (balanced with bluetooth), or the SMSL SU-8, or wait for the SU-9, or look at the offerings from Schiit. There are more options, but you go up in price. Hope this helps, Eric.