I was advised by the person who upgraded my Qud ESL 63's to use bare speaker cable wires, tinned. Then I was advised by another expert to use spade lugs instead, which I did. The spades made the system sound enormously better. I'm sure this is just one man's experience, and may not carry over, but for what it's worth, I thought I'd throw it in. I used good solder too, and then mediocre spade lugs at first.
Question for users of bare wire ends speaker cable
There have been discussions on the use of bare wire ends as being the best way to get a good quality speaker cable connection. The only downside is the need to re-do the connection often because of the corrosion of the copper. As a part way measure can the ends be soldered or something else, to cut down or stop the corrosion without adversely affecting the signal??