Bananas / Spades

I've never seen ferrules being used in a loudspeaker wire application. Do they make solid silver and solid copper ferrules? Or are they nickel and tin blends?

My my experience with the Furutech Flux bananas and spades is that the compression grub does not split stranded wire when it clamps down. Sealing it off with a bit of silicon before screwing on the barrel makes it nice and air tight.

That's why I wrote 'might'. It depends on the cable and the connector. Sometimes it is just better to screw directly on the strands as you described.
 
If you're looking for something other than spades or nanners, check out Neutrik Speakon connectors.
 
I like spades but I do not understand how terminating the wire with WBT ferrules and connecting ferrules to speaker and amp would be any worse.
 
The idea of using high quality sleeves/ferrules like those from ViaBlue or WBT has two advantages:

1. When using finely stranded conductors, the sleeve is placed and crimped onto the stranded wire using a high pressure crimp tool (WBT 0403). It effectively smashes the individual strands into a solid conductor and acts to protect against oxidation. This "solid conductor" can be seen after the crimp if you shear the sleeve/ferrule in half and look at the cross section.

2. After the crimp sleeve is in place, there is a little "crescent" depression produced along the length of the sleeve that the set-screws (grubs) on a given banana or spade connector (like the WBT or ViaBlue types) will grip instead of tightening into the bare strands which can break due to how fragile they are.
 
Very nice but do you know a single high-end loudspeaker using this?
Unfortunately, only a few active setups or those with outboard crossovers. I really wish they would catch on. No worries about connecting out of phase, falling out because your cat stepped on a cable, large chunks a cheap metal in the signal path, etc...
 
This is my understanding. My amp and speaker have a "wire hole" so ferrule into hole makes sense.
 
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