Agree as well. I use Cardas rca and xlr caps. Can't say I hear a difference but like the fact that dust does not get in these openings of my pre and cdp. This is a tweak to buy when you are in the mood to tweak, don't want to spend alot or be disappointed if the tweak does not improve your sound.
XLR & RCA caps
Does anyone use caps on the unused inputs and outputs of your components? can you hear a difference? does anyone use products like audioquests XLR caps? http://www.audioquest.com/audio-enhancements/xlr-noise-stopper-caps