Sound Blaster Omni Surround 5.1 USB card from Creative is a nice addition on systems which not support installation of internal solutions, being available on both Windows and OS X platforms. Even if the device has a small footprint, we do get connectivity for 5.1 systems, optical, but also integrated dual-microphone array along with an extra 3.5mm jack Mic-in and Line-in.



Link: Madshrimps