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PreSonus Eureka AD192 with EMU1820M sync issue

I am using the SPDIF out on my PreSonus Eureka to my EMU1820M SPDIF in. My host is set for 44Khz and my Eureka is set for the same. I am getting a low level crackle on my audio. If I set the Eureka to 88KHz it goes away but the tone suffers a tad.
Does anyone know If I need to use the BNC world clock to sync the EUreka to the EMUs 44Khz?