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The M2Tech HiFace Two USB to Coax Converter – It's all in the flavour » Adventures in Hifi Audio
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Douk Audio U2 XMOS XU208 Digital Interface, USB to TOSLINK Coaxial/Optical Audio Adapter, for DAC/Preamp/Amplifier, Support PCM & DSD64 (Upgrade Version): Amazon.com: Industrial & Scientific
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Quloos QU02 USB Bridge USB Digital Audio Interface to SPDIF AES/EBU I2S Support DSD512 - Walmart.com
Douk Audio U2 PRO XMOS XU208 Digital Interface, USB to TOSLINK Coaxial/Optical/HDMI IIS Audio Adapter, for DAC/Preamp/Amplifier, Support PCM & DSD256: Amazon.com: Industrial & Scientific