Sennheiser's GSX 1000 7.1 USB DAC; audio the way it wants to play - PC Perspective
Amazon.com: Sennheiser GSP 550 PC Gaming Headset with Dolby 7.1 Surround Sound, Flip-to-Mute microphone, USB connectivity for Dekstop and Laptop compatibility, Open-back ear cups, breathable fabric Headset, black : Video Games
Sennheiser PC 333 D Over-Ear Headphones, Adjustable Headband, Volume Control, Built-In Microphone, Noise-Canceling with 3D G4ME1 7.1 USB Sound Card, USB Extension Cable, Carrying Pouch, Black, Silver, 504126 - Walmart.com
Amazon.com: EPOS | Sennheiser GSX 1000 Gaming Audio Amplifier / External Sound Card, with 7.1 Surround Sound, Side Tone, Gaming DAC and EQ, Headphone amp Compatible with Windows, Mac, Laptops and Desktops. : Electronics