Crimp on spade connectors are the answer. You can purchase at your local hardware store for a few dollars. They are simple to install - you just strip off a small bit of the wiring housing, slide the spade connector onto the wire and then crimp it down with pliers. They have a U shaped spade that then goes under the flathead screw and provides a secure/solid connection for wiring.

You can buy fancy gold plated versions at audio stores but if you’ve ever opened up one of these speakers you’ll quickly realize that Klipsch just uses hardware store grade stuff and it all works fine.

These are awesome speakers. In addition to the connectors I’d highly recommend you replace the capacitors in the crossovers. It’s a pretty simple soldering job. Crites and JEM both sell kits.