The correct answer is: spade, bare wire, pin (the small cross drilled hole in the shaft takes a solid pin attached to the wire), banana jack, and double banana jack.
Connecting Amp to speakers
The humble banana plug, has not changed in its basic design since it’s invention, which I believe to be around 1929, many adaptations, but all following the basic design, so am I right in assuming this is the most efficient way to connect all these high end speakers and amps, which are discussed in these columns in great detail with their perceived audio attributes, along with speaker cable costing mega bucks, and all connected, I am assuming, to each other by a banana plug. Maybe the top flight kit has an alternative connecting system??