best digital cable,sonic frontier STF-1 transport;

HI,guys,just purchased a SF,transport to use with Kora Hermes DAC,my preamp is a VTL,5.5,and belles 350 ref.amp,Gabriel gold rev.IC's and HT,pro9 spks cables,looking for an open sound,detailed.try to use my cambridge 840c as transport,lost sound stage and top end with the 840 and Kora Hermes,Im currently using XLO,low end digital cable.any info.would be greatly apreciated; regards;