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EPOS GSX 1000 2nd Edition Dac Amp Audio Amplifier / External Usb Sound Card with 7.1 Surround Sound, Side Tone, Gaming DAC and EQ, Headphone Amp Compatible with Windows, Mac, Laptops and Desktops : Amazon.co.uk: Computers & Accessories
Sennheiser GSX 1000 user manual (English - 32 pages)