I have a pair of PSC Audio Custom MKII's and the company has a rather unique approach to the terminated spades. First the spades are cut from a pure silver sheet then coated in 10 alternate coats of silver and gold with the gold being on the outside. I don't know it this is the best way, or if it's better than bare wire, but it seems like this fanatical approach works in my system. Maybe it could be reproduced from a local jeweler on your own speaker cable/spades.
