I like plugs that I can tighten for maximum contact. One should on occasion remove the cables to service that contacts to remove any oxidation, etc. This might be the best thing you can do, and it is free.
rca plugs - comparisons?
anyone test or compare rca plugs on identical cables, noticed diffences or improvements? top wbt and eichman rca's have "new and improved" designs, are they better, or just different? is it worth the expense to change/upgrade the plugs on a decent older cable or specify the expensive wbt's, where it is optional?