I have a very good condition set up that I just don't use or is too nice for what I use headphones for. Comes with original boxes the usb sound blaster to update the dac which I never did and the acss cable. I do remember the person I got this from said the NFB 1 has the 6db bump for powering hard to drive headphones. I used this with Beyerdynamic T1.2 and HE500 and both sounded great. For the money these have a very good sound. Not the strongest in punchy bass but this will play low. Thanks for looking.