Must be the box if there are no switches that could be set wrong. Everyone makes a mistake once in a while, even Chris. If so, he will make things right.
You'll need the box to run CA-14's optimally through the D50 unless it provides 5 volts of plug in power. I'm pretty sure it doesn't, especially since it will power Sonic Studios DSM mics perfectly according to guysonic and they require very low voltage.