I'm having some difficulty getting a decent join connecting 2 bits of 80
strand speaker cable using my cheap but reasonable (CPC IIRC, and the crimps)
crimp connectors. The wire, or rather one side, is quite easy to pull from the
connector. I've tried adjusting the tool and various permutations, but it's
looking like solder, as this bloke found too:

https://youtu.be/nvPESov0HbY
(from about 5.30)

I've used them before on solid cable and they seemed fine. Not sure why
they're not working now . . .

--
Cheers, Rob