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What do I need to connect a stereo 3.5mm audio device like a phone to the coaxial S/PDIF input (in red) on my Behringer UMC1820? Do I need a DAC or just
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Behringer MS-20 - 20-Watt 24/192 Digital Stereo Nearfield Monitors with SPDIF and Optical Inputs - Pair
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