I figured it out. As long as one connection is locked, you have to unlock the other. I had the coax connection locked but had to disconnect the coax cable in order to lock the USB input.
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McIntosh MC500, McIntosh C48, PS Audio DirectStream Sr., Celestion Ditton 66, Marantz SA-14S1, SVS SB-2000 Pro, Aurender N100H, Matrix X-SPIDIF-2 DDC
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