DAC as an USB to SPDiF converter

I have decent studio DAC from Antelope Audio model Zodiac Gold. I use it mainly to play files from HD since I have a decent library of redbook , High rez and DCD files .For a change of presentation I took it's SPDiF output to feed an older dac which has no USB input effectively using Zodiac as a USB SPDiF. I have problem with noise between tracks . Any idea how to fix it ?
These are specs on Zodiac digital outputs
1x AES/EBU De-Jittered, re-clocked Digital Output. 110 Ω. 2x S/PDIF De-Jittered, re-clocked Digital Outputs. 75 Ω.
I will add that input of an older Dac either re-clocks the signal or uses custom jitter reduction process (those are the options to chose)