If I had speaker cables like those that were already terminated, I wouldn’t try to reterminate them because you might run into trouble if you’re not really experienced. Having said that, I had read in recent years that brass wasn’t as good as conductor as copper, so I decided to change the binding posts on my speakers to KLE low mass copper from the heavy brass ones that they came with, and the positive sonic difference was noticeable.
More recently, I bought a different set of speakers that are single wire, and I had a bit of a problem, because my favored cables were an internally biwired set. For a few weeks I used them with the unused banana plugs just hanging out in free space, obviously not a good idea.
I then remembered that I had for many years these Monster cable heavy brass banana five-way things that would allow me to put the other two banana terminated wired in contact with the speaker. I lived with that for several weeks until I remembered that I had seen some piggyback bananas once, and if I could find them it would solve my problem. I did some research and found solid copper piggyback bananas on walmart.com (of all places!) for $19.00 for the 4 pieces that I needed. The were made with set screws (no soldering) and I did the job two days ago.
Punchline, the difference sonically is a revelation! For the first time in three months, I am realizing how good my speakers really are. I am still shocked.
I have since looked at binding posts and RCA’s on walmart.com, and it turns out that they are a great source for these things at extremely affordable prices.