Sennheiser GSX 300 External Sound Card White | Techinn
EPOS I Sennheiser GSX 300, Gaming Dac/External Sound Card with 7:1 Surround, High Resolution Audio EQ presets for Gaming, Movies and Music - Audio Gaming Amplifier for PC and MAC Compatible, Black -
EPOS-Sennheiser GSX 1200 Pro Gaming Series Audio Amplifier Review
Sennheiser GSX 1000 Review: The Best Gaming DAC? – The Tech Frontier