Basic answer.
Interconnects and speaker wires are different things. Interconnects are terminated with rca plugs or din connectors and are used to connect things like CD players to the amplifier. Speaker wires are basically twinlead wires terminated with spades, banana plugs, or simply bare wire. They connect the amplifier to the speakers via the binding posts on each.
The high and low terminals on the speakers all need to be used. The high terminals feed the mid/tweeters and the low terminals feed the woofers. This is usually done by connecting the high and low for each together with a short wire. For example, the red high to the red low, and the black high to the black low. A single pair of speaker wires from the amplifier is then attached to either the high red and black or to the low red and black terminals.
Hope this helps,
Bill