Hello, I would like to sell my used headphone amplifier. It has TXCO Clock upgrade from factory.Compatibility with drivers on Windows 10. Win 11 not compatible. SHIPPING TO EU ONLY. You can see a review for example here: https://www.head-fi.org/showcase/audio-gd-nfb-15-1.14507/reviewsIt was a great selling device, lots of good reviews, was working great, I have used it with Sennheiser HD600 with great success. Main Features: DAC Chips:2× Wolfson WM8741 USB Interface:VIA VT1731 with asynchronous transfer support Supported Sample Rates:USB: Up to 192 kHz / 24-bitCoaxial Input: Up to 192 kHz / 24-bitOptical Input: Up to 96 kHz / 24-bit Inputs:USBCoaxial S/PDIFOptical S/PDIF Outputs:Headphone outputFixed-level RCA analog outputVariable-level RCA analog output (Preamp function) Headphone Amplifier Output Power:3500 mW @ 25 ?1800 mW @ 50 ?900 mW @ 100 ?300 mW @ 300 ?150 mW @ 600 ? Output Impedance:2 ? (both headphone and DAC outputs) Frequency Response:20 Hz – 20 kHz (-0.2 dB) Signal-to-Noise Ratio (SNR):118 dB Power Consumption:11 W Weight:2 kg