SPDIF Caps

[The Sandman]

I've gone through my system and capped off the unused RCA and XLR jacks on my preamp, CD player, and F112s. The RCA inputs have Cardas shorting caps, the RCA outputs and all of the XLRs have nonshorting caps. The Cardas connector caps can be seen here: Cardas Audio

My CD player also has a set of SPDIF jacks - one in, one out. What kind of caps (if any) should I be using on these?

[Still-One]

I purchased some Cardas Signature caps several years ago to place on the extra RCA jacks. Too much of a pain to get on and off so they sit in a drawer. I truly have no idea if they had any impact.

Jim