Silver spades

Alot of my xlr have silver rather than gold connectors.they do need to be cleaned on occasion.dont know that it changes the sound much but it is a cleaner connection and silver is a good conductor used in alot of electronics.you try it tell us what you think.have one with one without have a friend switch the cabels and not tell you and see if you can tell.have fun experimenting .

Silver is a better conductor than gold or copper.  Gold is often plated onto other metals because plating is cheap and gold does not oxidize.  Silver oxidizes, but, silver oxides are quite conductive too (though not as much as pure silver), so it may not make sense to constantly clean and polish silver connectors or binding posts.  Also, when two metal surfaces are pushed together quite hard, like when you tighten down a spade, or squeeze in a banana plug, the points of contact of the metal tend to be gas tight so those contact points won'[t oxidize.  

Total spade resembles roughly AWG10 and distance of 1/2".  Copper 10AWG resistivity is about 0.001ohm per foot. 1/2" spade would have resistance of 0.000042 ohm.  Silver spade would be 0.00004 ohm, while aluminum spade would be 0.00007 ohm.   Such short connection would not make audible difference, at least from the point of conductivity.  Yes, silver wires have reputation of sounding brighter, but here we're talking of 1/2" added silver on the top of 6ft of copper speaker wire.

The only thing you'll be opening up is your wallet and your hindquarters.