ASUS Xonar U1 5.1channels USB

Xonar U1 - UA100, 48KHz, USB Stylish External Processor
Crisp Clear & Gaming Audio Support
Xonar U1 transcodes any stereo source into Dolby Headphone, Virtual Speaker, and 5.1-channel Dolby Digital & Pro-Logic II surround sound. It also supports DirectSound, EAX, OpenAL for best gaming in Windows Vista and XP.

High Fidelity Headphone Amp
For High End Headphone Enjoyments
Xonar U1’s built-in high-fidelity headphone amplifier achieves best listening quality with most stereo headphones (8~150 ohms @ >10mWx2):
- THD+N<0.005% @ 47mW x2/32ohms
- THD+N<0.006% @ 88mW x2/16ohms

Dolby Home Theater Technologies
High Quality Audio From Dolby
Xonar U1 tanscodes stereo audio source into Dolby Headphone, Virtual Speaker, and even 5.1-channel Dolby Digital and Pro-Logic II surround sound output.

Array Microphone Bundled
Best for VoIP
The bundled advanced Array MIC technology can suppress ambient noises for up-to-20 dB, leaving only front-side clear voice for VOIP applications (Skype, MSN, Google, QQ, etc.) or online gaming.