I will tell you the $50, or $100 Pangea receptacles are all Copper ,and Gold plated
much heavier built then most even at much more monies and they grip the connectors very good , That be said , fits Equally important to have similar quality
pieces, and make connectors ,for many lesser cables use Brass ,not that great a conductor just loook under metals conductivity chart, Silver if roughly a 67, Copper a 64, Brass maybe a 24. You can spend $300 if you want ,also in your line conditioners many use cheaper Hubble receptacles ,fine for industrial but not Audiophile this creates a resistive Bottleneck Copper+ rhodium ,or Gold , ,look on your interconnects, and speaker cables as well , what’s the point of all quality wire then cheap connectors at the end, it’s like putting cheap tires on a Ferrari.