Don't use solder on speaker wire, for the same reason you don't use it on 200A electrical connections. It makes the wire brittle and is low conductivity. Always crimp.
Speaker binding posts with plastic covers
My Krell amplifier has speaker binding posts with the clear plastic covers. Apparently these are for EU safety requirements. I want to use spade connectors and have no idea how to open these covers. I’ve wrestled with them but they don’t budge. I don’t even know whether they unscrew or pull out or whether there is some other method at play. Does anyone have experience with these?