RCA Caps

Like the Cardas Caps they don't having to be shorting type caps to be effective. Cardas type caps are simple covers for unused input and output plugs. They should be placed over ALL input and output plugs for max benefit. Copper foil can be used in lieu of the real McCoy. 

Georgie Boy, if I were you I'd seriously consider modifying your post to say, Cardas caps do nothing for the sound that I'm aware of. There, that's more like it!

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wolf_garcia
Another solution is to chew a piece of gum along with shreds of aluminum foil and copper shavings. Once chewed, remove the metal reinforced gum and stick it on the unused RCA plugs. Done!

Yeah, but you have to be able to walk and chew gum simultaneously.

No brainer. Good one! By the way, if memory serves putting Cardas caps on unused inputs/outputs on the TV and other non-audio components like the cable box helped the sound, too. I’ve got something similar. You know, keeps the dust out. 😬I know what you're thinking. "We want things that make good engineering and scientific sense." 😛

Gold Star for best quote of the week! ⭐️

"Not due to any negative attitude on my part- I maintained a long cordial relationship with the parts department for decades."