Can you not just unscrew them? I think the tabs on the two pieces of plastic 'covers' are there to facilitate that.
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?