A+ has a setting that allows you to limit the frequency limit of a USB interface. Check that it's not limited to 192kHz.
Also are you connecting directly to the Antelope or do you use a USB-SPDIF/I2S interface that's limited to 192kHz?
Also are you connecting directly to the Antelope or do you use a USB-SPDIF/I2S interface that's limited to 192kHz?