I've learned that unfortunately every cable including digital ones make a difference in the sound emanating from your speakers. I have used the Belden from Blue Jeans for digital, among others with good results.
Blue Jeans Digital cable choices
I see Blue Jeans offers several different S/PDIF cables- Belden 1694A and Canare LV-77S in particular. Any opinions as to the superiority of one over the other?