What you are talking about is an item intended to damp vibrations in the connectors. Here are a few takes on this. Some folks do nothing and are perfectly happy with the sound of their systems. Others have reported that wrapping the connectors with teflon tape helps. Some, like me, have purchased the Herbies (I use them on RCA's) and can't really say for sure there is a difference, but since their systems sound good they (we) believe the dampers can't hurt.
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