Is the ZEN Stream compatible with my existing S/PDIF-input DAC with max capability of 192kHz?

The ZEN Stream has two outputs, USB and S/PDIF coaxial. The coaxial output complies with S/PDIF standards with a maximum frequency of 192kHz for existing and older DACs.

You can also play DSD files up to DSD128 through the coaxial output – it converts them to PCM 192kHz.