Amazon.com: Creative Sound Blaster X4 Hi-Res 24bit/192kHz External USB DAC and Amp Sound Card, Super X-Fi, Multi-Channel, 7.1 Discrete Surround, Optical-in, Optical-out, Line-in, Mic-in, Headset-in for PC and Mac : Electronics
Creative Sound Blaster Extigy:
CREATIVE LABS AUDIGY
Amazon.com: Creative Sound Blaster X-Fi Surround 5.1 Pro USB Audio System with SBX SB1095 : Electronics
Creative Sound Blaster X4 USB DAC Review – Play3r
Surround sound - Wikipedia
Reverb with AudioHQ
SB Audigy 2 Platinum and REW | Home Theater Forum and Systems
Mixing in Surround: DOs and DON'Ts - Waves Audio
Creative Surround Mixing Tips For 7.1 & 8.2 | Greg Gordon - Pyramind Institute