Those are active monitors, so you won't need an amp. You could use them without a dac as well from your computer. They will benefit from dac tho and some have reported that they have hum when connected directly to computer and using dac have got rid of the hum. ODAC for example would work in your situation. As for cables, I think they come with power cord so you would need to get cables for connecting between dac/computer and the needed cable will very on your setup.