GSX 1000 from EPOS | Enhanced surround sound audio for immersive gaming
Amazon.com: Sennheiser GSX 1000 Gaming Audio Amplifier, 7.1 Surround Sound, PC and MAC, Gaming DAC and EQ, for W with Sennheiser PCV 05 Combo Audio Adapter : Video Games
Sennheiser GSX 1000 Review: The Best Gaming DAC? – The Tech Frontier