Dubbed the Xonar U3, this USB dongle features the same audio chip and pre-programmed "pop" that our blind listeners liked so much in the DG. A headphone amplifier optimized for 32-150 Ω has been squeezed into the device, which is no larger than a thumb drive. You also get virtualization software to emulate EAX positional audio effects and to simulate surround-sound speakers with stereo headphones.
Source: The Tech Report