This is a very subtle tweak, but I beleive they offer an improvement. After covering all the unused jacks in my system with Cardas caps, I listened for several weeks. I then removed them all and noticed that the HF had a bit of an edge and the mids were a bit unfocused. I would recommend covering all the unused jacks, as this is a relatively inexpensive tweak.
As for unused XLRs, the same test yielded similar results, but the cost for Cardas XLR caps is several times the cost of RCA jacks.
Good luck!
As for unused XLRs, the same test yielded similar results, but the cost for Cardas XLR caps is several times the cost of RCA jacks.
Good luck!