The supported sample rates (using the digital input) for the DS-series monitors are as follows:
DS-90/DS-90A support sample rates ranging from 25k to 55kHz.
DS-50's and DS-30's support sample rates from 32k to 96kHz.
DS-90/DS-90A support sample rates ranging from 25k to 55kHz.
DS-50's and DS-30's support sample rates from 32k to 96kHz.