You're probably thinking of shorting plugs; I use them on the unused phono inputs on my Lamm phono stage and Jadis preamp (the rest of the inputs are currently used). Cardas also makes metal caps to put over the unused inputs. I can't say how much of a difference the shorting plugs make in my system, as I haven't really noticed much of a difference, but they don't hurt.
Covers on unused RCA inputs?
Years ago, I vaguely remember being advised to put little plastic covers on the unused RCA inputs on the back on my preamp. These plastic plugs had a piece of metal that connected the two poles of the RCA input. The theory was, by bridging the two sides of the RCA input, ambient RFI and static electricity were blocked from entering the preamp, resulting in a lower noise floor.
Of course, these plugs could only be used on RCA inputs, not outputs, as this would short circuit and possibly damage the preamp.
Has anyone heard of these gadgets? Does anyone use them currently? Thank you.
Of course, these plugs could only be used on RCA inputs, not outputs, as this would short circuit and possibly damage the preamp.
Has anyone heard of these gadgets? Does anyone use them currently? Thank you.